Substituted diphenyl isoxazoles, pyrazoles and oxadiazoles useful for treating HCV infection

ABSTRACT

The present invention relates to substituted diphenyl heterocycle compounds and pharmaceutical compositions thereof that inhibit replication of HCV virus. The present invention also relates to the use of the compounds and/or compositions to inhibit HCV replication and/or proliferation and to treat or prevent HCV infections.

CROSS-REFERENCE TO RELATED APPLICATION

[0001] This application claims benefit under 35 U.S.C. § 119(e) to U.S. Provisional Application Ser. No. 60/467,811, filed May 2, 2003.

1. FIELD OF INVENTION

[0002] The present invention relates to substituted diphenyl heterocycles and compositions thereof useful for treating or preventing Hepatitis C virus (HCV) infections. In particular, the present invention relates to substituted diphenyl isoxazole, pyrazole and oxadiazole compounds, compositions comprising the compounds and the use of such compounds and compositions to inhibit HCV replication and/or proliferation as a therapeutic approach towards the treatment and/or prevention of HCV infections in humans and animals.

2. BACKGROUND OF THE INVENTION

[0003] Hepatitis C virus (HCV) infection is a global human health problem with approximately 150,000 new reported cases each year in the United States alone. HCV is a single stranded RNA virus, which is the etiological agent identified in most cases of non-A, non-B post-transfusion and post-transplant hepatitis and is a common cause of acute sporadic hepatitis (Choo et al., Science 244:359, 1989; Kuo et al., Science 244:362, 1989; and Alter et al., in Current Perspective in Hepatology, p. 83, 1989). It is estimated that more than 50% of patients infected with HCV become chronically infected and 20% of those develop cirrhosis of the liver within 20 years (Davis et al., New Engl. J. Med. 321:1501, 1989; Alter et al., in Current Perspective in Hepatology, p. 83, 1989; Alter et al., New Engl. J. Med. 327:1899, 1992; and Dienstag Gastroenterology 85:430, 1983). Moreover, the only therapy available for treatment of HCV infection is interferon-α (INTRON® A, PEG-INTRON®A, Schering-Plough; ROFERON-A®, PEGASys®, Roche). Most patients are unresponsive, however, and among the responders, there is a high recurrence rate within 6-12 months after cessation of treatment (Liang et al., J. Med. Virol. 40:69, 1993). Ribavirin, a guanosine analog with broad spectrum activity against many RNA and DNA viruses, has been shown in clinical trials to be effective against chronic HCV infection when used in combination with interferon-α (see, e.g., Poynard et al., Lancet 352:1426-1432, 1998; Reichard et al., Lancet 351:83-87, 1998), and this combination therapy has been recently approved (REBETRON, Schering-Plough; see also Fried et al., 2002, N. Engl. J. Med. 347:975-982). However, the response rate is still at or below 50%. Therefore, additional compounds for treatment and prevention of HCV infection are needed.

3. SUMMARY OF THE INVENTION

[0004] In one aspect, the present invention provides substituted diphenyl heterocycles that are potent inhibitors of Hepatitis C virus (“HCV”) replication and/or proliferation. In one embodiment, the compounds are substituted diphenyl isoxazole, pyrazole and/or oxadiazole compounds according to structural formula (I):

[0005] where Z is CH (isoxazoles, or pyrazoles) or N (oxadiazoles) and X and Y are each, independently of one another, O and N, provided that: (i) X and Y are not both 0 and (ii) when X and Y are each N, then Z is CH. The “A” phenyl ring includes at least one, and in many instances two, substituents positioned ortho to the point of attachment (R² and/or R⁶) and optionally from 1 to 4 additional substituents, which may be the same or different. Although the “A” ring may include a single ortho (R² or R⁶) substituent, compounds which include two ortho substituents (R² and R⁶) are particularly active and useful. It is preferable that at least one of the substituent groups at positions R² and/or R⁶ provide some steric bulk. For example, it is preferable that the R² and/or R⁶ substituent be larger than a fluoro group.

[0006] The nature of the R² and/or R⁶ substituents, as well as the optional substituents at positions R³, R⁴ and R⁵, can vary widely. As a consequence, the “A” phenyl ring may be substituted with virtually any substituent groups, provided that at least one of R² or R⁶ is other than hydrogen. When the “A” phenyl ring includes more than one substituent, the substituents may be the same or different. Typical substituent groups useful for substituting the “A” ring include, but are not limited to, branched, straight-chain or cyclic alkyls, mono- or polycyclic aryls, branched, straight-chain or cyclic heteroalkyls, mono- or polycyclic heteroaryls, halos, branched, straight-chain or cyclic haloalkyls, hydroxyls, oxos, thioxos, branched, straight-chain or cyclic alkoxys, branched, straight-chain or cyclic haloalkoxys, trifluoromethoxys, mono- or polycyclic aryloxys, mono- or polycyclic heteroaryloxys, ethers, alcohols, sulfides, thioethers, sulfanyls (thiols), imines, azos, azides, amines (primary, secondary and tertiary), nitriles (any isomer), cyanates (any isomer), thiocyanates (any isomer), nitrosos, nitros, diazos, sulfoxides, sulfonyls, sulfonic acids, sulfamides, sulfonamides, sulfamic esters, aldehydes, ketones, carboxylic acids, esters, amides, amidines, formadines, amino acids, acetylenes, carbamates, lactones, lactams, glucosides, gluconurides, sulfones, ketals, acetals, thioketals, oximes, oxamic acids, oxamic esters, etc., and combinations of these groups.

[0007] These substituent groups may be further substituted at one or more available carbon or heteroatoms with the same or different additional substituents, which may be selected from the substituents described above. Any reactive functionalities in the groups used to substituted the “A” phenyl ring may be masked with a protecting group or a progroup, as is well-known in the art.

[0008] The substituent groups may be attached directly to the phenyl ring, or they may be spaced away from the ring by way of a linker. The nature of the linker can vary widely, and can include virtually any combination of atoms or groups useful for spacing one molecular moiety from another. For example, the linker may be an acyclic hydrocarbon bridge (e.g, a saturated or unsaturated alkyleno such as methano, ethano, etheno, propano, prop[1]eno, butano, but[1]eno, but[2]eno, buta[1,3]dieno, and the like), a monocyclic or polycyclic hydrocarbon bridge (e.g., [1,2]benzeno, [2,3]naphthaleno, and the like), a simple acyclic heteroatomic or heteroalkyldiyl bridge (e.g., —O—, —S—, —S—O—, —NH—, —C(O)—, —C(O)NH—, —NHC(O)O—, —S(O)—, —S(O)₂—, —S(O)NH—, —S(O)₂NH—, —O—CH₂—, —CH₂—O—CH₂—, —O—CH═CH—CH₂—, and the like), a monocyclic or polycyclic heteroaryl bridge (e.g., [3,4]furano, [2,3]-furano, pyridino, thiopheno, piperidino, piperazino, pyrazidino, pyrrolidino, and the like) or combinations of such bridges. In one embodiment, the “A” ring is substituted at both R² and R⁶ with the same or different halo, alkyl, substituted alkyl, alkoxy, substituted alkoxy, methoxy, haloalkyl, trifluoromethyl, 5-6 membered cycloheteroalkyl or substituted 5-6 membered cycloheteroalkyl group.

[0009] The “C” ring is substituted at the meta position with a group of the formula —NR¹¹C(O)R¹², where R¹¹ is hydrogen or lower alkyl and R¹² is monohalomethyl or dihalomethyl. The “C” ring may optionally include from 1 to 4 additional substituents (R⁸, R⁹, R¹⁰ and/or R¹³), which may be the same or different. As for the “A” phenyl ring, the nature of the optional R⁸, R⁹, R¹⁰ and R¹³ substituents can vary broadly. Groups useful for substituting the “C” phenyl ring are the same as those described for the “A” phenyl ring, supra. In one embodiment, the “C” ring does not include optional substituents, such that R⁸, R⁹, R¹⁰ and R¹³ are each hydrogen.

[0010] As will be recognized by skilled artisans, the actual electron distribution or double bonding pattern of the “B” ring will depend upon the identities of substituents X and Y. As illustrated, structural formula (I) is specifically intended to include at least the following six structures:

[0011] In another aspect, the invention provides starting and intermediate compounds useful for synthesizing the compounds of the invention. Representative starting and intermediate compounds useful for synthesizing isoxazole and pyrazole compounds of the invention include compounds 201, 203, 205, 207, 209, 223, 225, 227, 229, 231, 245, 247, 248a, 248b, 249, 257 and 259 as depicted in FIGS. 1-7. Representative starting and intermediate compounds useful for synthesizing oxadiazole compounds of the invention include compounds 265, 267, 269, 271, 285, 287 and 289 as depicted in FIGS. 1-7.

[0012] In one embodiment, the intermediates are compounds according to structural formula (II):

[0013] wherein R¹⁵ is NO₂ or NHR, where R is hydrogen, lower alkyl or a protecting group and X, Y, Z, R², R³, R⁴, R⁵, R⁶, R⁸, R⁹, R¹⁰ and R¹³ are as previously defined for structural formula (I) and subject to the same provisos. Like the compounds of structural formula (I), in the compounds of structural formula (II) the double bonding pattern will depend upon the identities of substituents X and Y.

[0014] In another aspect, the invention provides methods of making the substituted diphenyl heterocycle compounds of structural formula (I) or (II). Specific exemplary embodiments of the methods are illustrated in FIGS. 1-13. In one embodiment, the method for synthesizing compounds according to structural formula (I) comprises optionally alkylating a compound according to structural formula (II) in which R¹⁵ is NHR with an alkylating agent (e.g., R¹¹-halide) followed by optional deprotection and acylation with an acylating agent of the formula LG-C(O)—R¹², where “LG” represents a leaving group or an activating group and R¹² is as previously defined in connection with the compounds of formula (I).

[0015] In another aspect, the present invention provides compositions comprising the compounds of the invention. The compositions generally comprise a substituted diphenyl isoxazole, pyrazole or oxadiazole of the invention, or a salt, hydrate, solvate, N-oxide or prodrug thereof and a suitable excipient, carrier or diluent. The composition may be formulated for veterinary uses or for use in humans.

[0016] The compounds of the invention are potent inhibitors of HCV replication and/or proliferation. Accordingly, in still another aspect, the present invention provides methods of inhibiting HCV replication and/or proliferation, comprising contacting a Hepatitis C virion with an amount of a compound or composition of the invention effective to inhibit its replication or proliferation. The methods may be practiced either in vitro or in vivo, and may be used as a therapeutic approach towards the treatment and/or prevention of HCV infections.

[0017] In a final aspect, the present invention provides methods of treating and/or preventing HCV infections. The methods generally involve administering to a subject that has an HCV infection or that is at risk of developing an HCV infection an amount of a compound or composition of the invention effective to treat or prevent the HCV infection. The method may be practiced in animals in veterinary contexts or in humans.

4. BRIEF DESCRIPTION OF THE FIGURES

[0018]FIGS. 1-13 provide exemplary synthetic schemes for synthesizing the compounds of the invention.

5. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] 5.1 Definitions

[0020] As used herein, the following terms are intended to have the following meanings:

[0021] “Alkyl,” by itself or as part of another substituent, refers to a saturated or unsaturated, branched, straight-chain or cyclic monovalent hydrocarbon radical derived by the removal of one hydrogen atom from a single carbon atom of a parent alkane, alkene or alkyne. Typical alkyl groups include, but are not limited to, methyl; ethyls such as ethanyl, ethenyl, ethynyl; propyls such as propan-1-yl, propan-2-yl, cyclopropan-1-yl, prop-1-en-1-yl, prop-1-en-2-yl, prop-2-en-1-yl (allyl), cycloprop-1-en-1-yl; cycloprop-2-en-1-yl, prop-1-yn-1-yl, prop-2-yn-1-yl, etc.; butyls such as butan-1-yl, butan-2-yl, 2-methyl-propan-1-yl, 2-methyl-propan-2-yl, cyclobutan-1-yl, but-1-en-1-yl, but-1-en-2-yl, 2-methyl-prop-1-en-1-yl, but-2-en-1-yl, but-2-en-2-yl, buta-1,3-dien-1-yl, buta-1,3-dien-2-yl, cyclobut-1-en-1-yl, cyclobut-1-en-3-yl, cyclobuta-1,3-dien-1-yl, but-1-yn-1-yl, but-1-yn-3-yl, but-3-yn-1-yl, etc.; and the like.

[0022] The term “alkyl” is specifically intended to include groups having any degree or level of saturation, i.e., groups having exclusively single carbon-carbon bonds, groups having one or more double carbon-carbon bonds, groups having one or more triple carbon-carbon bonds and groups having mixtures of single, double and triple carbon-carbon bonds. Where a specific level of saturation is intended, the expressions “alkanyl,” “alkenyl,” and “alkynyl” are used. Preferably, an alkyl group comprises from 1 to 15 carbon atoms (C₁-C₁₅ alkyl), more preferably from 1 to 10 carbon atoms (C₁-C₁₀ alkyl) and even more preferably from 1 to 6 carbon atoms (C₁-C₆ alkyl or lower alkyl).

[0023] “Alkanyl,” by itself or as part of another substituent, refers to a saturated branched, straight-chain or cyclic alkyl radical derived by the removal of one hydrogen atom from a single carbon atom of a parent alkane. Typical alkanyl groups include, but are not limited to, methanyl; ethanyl; propanyls such as propan-1-yl, propan-2-yl (isopropyl), cyclopropan-1-yl, etc.; butanyls such as butan-1-yl, butan-2-yl (sec-butyl), 2-methyl-propan-1-yl (isobutyl), 2-methyl-propan-2-yl (t-butyl), cyclobutan-1-yl, etc.; and the like.

[0024] “Alkenyl,” by itself or as part of another substituent, refers to an unsaturated branched, straight-chain or cyclic alkyl radical having at least one carbon-carbon double bond derived by the removal of one hydrogen atom from a single carbon atom of a parent alkene. The group may be in either the cis or trans conformation about the double bond(s). Typical alkenyl groups include, but are not limited to, ethenyl; propenyls such as prop-1-en-1-yl, prop-1-en-2-yl, prop-2-en-1-yl (allyl), prop-2-en-2-yl, cycloprop-1-en-1-yl; cycloprop-2-en-1-yl; butenyls such as but-1-en-1-yl, but-1-en-2-yl, 2-methyl-prop-1-en-1-yl, but-2-en-1-yl, but-2-en-1-yl, but-2-en-2-yl, buta-1,3-dien-1-yl, buta-1,3-dien-2-yl, cyclobut-1-en-1-yl, cyclobut-1-en-3-yl, cyclobuta-1,3-dien-1-yl, etc.; and the like.

[0025] “Alkynyl,” by itself or as part of another substituent refers to an unsaturated branched, straight-chain or cyclic alkyl radical having at least one carbon-carbon triple bond derived by the removal of one hydrogen atom from a single carbon atom of a parent alkyne. Typical alkynyl groups include, but are not limited to, ethynyl; propynyls such as prop-1-yn-1-yl, prop-2-yn-1-yl, etc.; butynyls such as but-1-yn-1-yl, but-1-yn-3-yl, but-3-yn-1-yl, etc.; and the like.

[0026] “Alkyldiyl” by itself or as part of another substituent refers to a saturated or unsaturated, branched, straight-chain or cyclic divalent hydrocarbon group derived by the removal of one hydrogen atom from each of two different carbon atoms of a parent alkane, alkene or alkyne, or by the removal of two hydrogen atoms from a single carbon atom of a parent alkane, alkene or alkyne. The two monovalent radical centers or each valency of the divalent radical center can form bonds with the same or different atoms. Typical alkyldiyl groups include, but are not limited to, methandiyl; ethyldiyls such as ethan-1,1-diyl, ethan-1,2-diyl, ethen-1,1-diyl, ethen-1,2-diyl; propyldiyls such as propan-1,1-diyl, propan-1,2-diyl, propan-2,2-diyl, propan-1,3-diyl, cyclopropan-1,1-diyl, cyclopropan-1,2-diyl, prop-1-en-1,1-diyl, prop-1-en-1,2-diyl, prop-2-en-1,2-diyl, prop-1-en-1,3-diyl, cycloprop-1-en-1,2-diyl, cycloprop-2-en-1,2-diyl, cycloprop-2-en-1,1-diyl, prop-1-yn-1,3-diyl, etc.; butyldiyls such as, butan-1,1-diyl, butan-1,2-diyl, butan-1,3-diyl, butan-1,4-diyl, butan-2,2-diyl, 2-methyl-propan-1,1-diyl, 2-methyl-propan-1,2-diyl, cyclobutan-1,1-diyl; cyclobutan-1,2-diyl, cyclobutan-1,3-diyl, but-1-en-1,1-diyl, but-1-en-1,2-diyl, but-1-en-1,3-diyl, but-1-en-1,4-diyl, 2-methyl-prop-1-en-1,1-diyl, 2-methanylidene-propan-1,1-diyl, buta-1,3-dien-1,1-diyl, buta-1,3-dien-1,2-diyl, buta-1,3-dien-1,3-diyl, buta-1,3-dien-1,4-diyl, cyclobut-1-en-1,2-diyl, cyclobut-1-en-1,3-diyl, cyclobut-2-en-1,2-diyl, cyclobuta-1,3-dien-1,2-diyl, cyclobuta-1,3-dien-1,3-diyl, but-1-yn-1,3-diyl, but-1-yn-1,4-diyl, buta-1,3-diyn-1,4-diyl, etc.; and the like. Where specific levels of saturation are intended, the nomenclature alkanyldiyl, alkenyldiyl and/or alkynyldiyl is used. Where it is specifically intended that the two valencies are on the same carbon atom, the nomenclature “alkylidene” is used. In preferred embodiments, the alkyldiyl group comprises from 1 to 6 carbon atoms (C1-C6 alkyldiyl). Also preferred are saturated acyclic alkanyldiyl groups in which the radical centers are at the terminal carbons, e.g., methandiyl (methano); ethan-1,2-diyl (ethano); propan-1,3-diyl (propano); butan-1,4-diyl (butano); and the like (also referred to as alkylenos, defined infra).

[0027] “Alkyleno,” by itself or as part of another substituent, refers to a straight-chain saturated or unsaturated alkyldiyl group having two terminal monovalent radical centers derived by the removal of one hydrogen atom from each of the two terminal carbon atoms of straight-chain parent alkane, alkene or alkyne. The locant of a double bond or triple bond, if present, in a particular alkyleno is indicated in square brackets. Typical alkyleno groups include, but are not limited to, methano; ethylenos such as ethano, etheno, ethyno; propylenos such as propano, prop[1]eno, propa[1,2]dieno, prop[1]yno, etc.; butylenos such as butano, but[1]eno, but[2]eno, buta[1,3]dieno, but[1]yno, but[2]yno, buta[1,3]diyno, etc.; and the like. Where specific levels of saturation are intended, the nomenclature alkano, alkeno and/or alkyno is used. In preferred embodiments, the alkyleno group is (C1-C6) or (C1-C3) alkyleno. Also preferred are straight-chain saturated alkano groups, e.g., methano, ethano, propano, butano, and the like.

[0028] “Alkoxy,” by itself or as part of another substituent, refers to a radical of the formula —OR, where R is an alkyl or cycloalkyl group as defined herein. Representative examples alkoxy groups include, but are not limited to, methoxy, ethoxy, propoxy, isopropoxy, butoxy, tert-butoxy, cyclopropyloxy, cyclopentyloxy, cyclohexyloxy and the like.

[0029] “Alkoxycarbonyl,” by itself or as part of another substituent, refers to a radical of the formula —C(O)-alkoxy, where alkoxy is as defined herein.

[0030] “Alkylthio,” by itself or as part of another substituent, refers to a radical of the formula —SR, where R is an alkyl or cycloalkyl group as defined herein. Representative examples of Alkylthio groups include, but are not limited to, methylthio, ethylthio, propylthio, isopropylthio, butylthio tert-butylthio, cyclopropylthio, cyclopentylthio, cyclohexylthio, and the like.

[0031] “Aryl,” by itself or as part of another substituent, refers to a monovalent aromatic hydrocarbon group derived by the removal of one hydrogen atom from a single carbon atom of a parent aromatic ring system, as defined herein. Typical aryl groups include, but are not limited to, groups derived from aceanthrylene, acenaphthylene, acephenanthrylene, anthracene, azulene, benzene, chrysene, coronene, fluoranthene, fluorene, hexacene, hexaphene, hexalene, as-indacene, s-indacene, indane, indene, naphthalene, octacene, octaphene, octalene, ovalene, penta-2,4-diene, pentacene, pentalene, pentaphene, perylene, phenalene, phenanthrene, picene, pleiadene, pyrene, pyranthrene, rubicene, triphenylene, trinaphthalene and the like. Preferably, an aryl group comprises from 6 to 20 carbon atoms (C₆-C₂₀ aryl), more preferably from 6 to 15 carbon atoms (C₆-C₁₅ aryl) and even more preferably from 6 to 10 carbon atoms (C₆-C₁₀ aryl).

[0032] “Arylalkyl,” by itself or as part of another substituent, refers to an acyclic alkyl group in which one of the hydrogen atoms bonded to a carbon atom, typically a terminal or sp³ carbon atom, is replaced with an aryl group as, as defined herein. Typical arylalkyl groups include, but are not limited to, benzyl, 2-phenylethan-1-yl, 2-phenylethen-1-yl, naphthylmethyl, 2-naphthylethan-1-yl, 2-naphthylethen-1-yl, naphthobenzyl, 2-naphthophenylethan-1-yl and the like. Where specific alkyl moieties are intended, the nomenclature arylalkanyl, arylalkenyl and/or arylalkynyl is used. Preferably, an arylalkyl group is (C₆-C₃₀) arylalkyl, e.g., the alkanyl, alkenyl or alkynyl moiety of the arylalkyl group is (C₁-C₁₀) alkyl and the aryl moiety is (C₆-C₂₀) aryl, more preferably, an arylalkyl group is (C₆-C₂₀) arylalkyl, e.g., the alkanyl, alkenyl or alkynyl moiety of the arylalkyl group is (C₁-C₈) alkyl and the aryl moiety is (C₆-C₁₂) aryl, and even more preferably, an arylalkyl group is (C₆-C₁₅) arylalkyl, e.g., the alkanyl, alkenyl or alkynyl moiety of the arylalkyl group is (C₁-C₅) alkyl and the aryl moiety is (C₆-C₁₀) aryl.

[0033] “Aryloxy,” by itself or as part of another substituent, refers to a radical of the formula —O-aryl, where aryl is as defined herein.

[0034] “Arylalkyloxy, by itself or as part of another substituent, refers to a radical of the formula —O-arylalkyl, where arylalkyl is as defined herein.

[0035] “Aryloxycarbonyl,” by itself or as part of another substituent, refers to a radical of the formula —C(O)—O-aryl, where aryl is as defined herein.

[0036] “Carbamoyl,” by itself or as part of another substituent, refers to a radical of the formula —C(O)NR′R″, where R′ and R″ are each, independently of one another, selected from the group consisting of hydrogen, alkyl and cycloalkyl as defined herein, or alternatively, R′ and R″, taken together with the nitrogen atom to which they are bonded, form a 5-, 6- or 7-membered cycloheteroalkyl ring as defined herein, which may optionally include from 1 to 4 of the same or different additional heteroatoms selected from the group consisting of O, S and N.

[0037] “Compounds of the invention” refers to compounds encompassed by the various descriptions and structural formulae disclosed herein. The compounds of the invention may be identified by either their chemical structure and/or chemical name. When the chemical structure and chemical name conflict, the chemical structure is determinative of the identity of the compound. The compounds of the invention may contain one or more chiral centers and/or double bonds and therefore may exist as stereoisomers, such as double-bond isomers (i.e., geometric isomers), rotamers, atrophisomers, enantiomers or diastereomers. Accordingly, when stereochemistry at chiral centers is not specified, the chemical structures depicted herein encompass all possible configurations at those chiral centers including the stereoisomerically pure form (e.g., geometrically pure, enantiomerically pure or diastereomerically pure) and enantiomeric and stereoisomeric mixtures. Enantiomeric and stereoisomeric mixtures can be resolved into their component enantiomers or stereoisomers using separation techniques or chiral synthesis techniques well known to the skilled artisan. The compounds of the invention may also exist in several tautomeric forms including the enol form, the keto form and mixtures thereof. Accordingly, the chemical structures depicted herein encompass all possible tautomeric forms of the illustrated compounds. The compounds of the invention may also include isotopically labeled compounds where one or more atoms have an atomic mass different from the atomic mass conventionally found in nature. Examples of isotopes that may be incorporated into the compounds of the invention include, but are not limited to, ²H, ³H, ¹¹C, ¹³C, ¹⁴C, ¹⁵N, ¹⁸O, ¹⁷O, ³¹P, ³²P, ³⁵S, ¹⁸F and ³⁶Cl. Compounds of the invention may exist in unsolvated forms as well as solvated forms, including hydrated forms and as N-oxides. In general, the hydrated, solvated and N-oxide forms are within the scope of the present invention. Certain compounds of the present invention may exist in multiple crystalline or amorphous forms. In general, all physical forms are equivalent for the uses contemplated by the present invention and are intended to be within the scope of the present invention.

[0038] “Cycloalkyl,” by itself or as part of another substituent, refers to a saturated or unsaturated cyclic alkyl radical, as defined herein. Where a specific level of saturation is intended, the nomenclature “cycloalkanyl” or “cycloalkenyl” is used. Typical cycloalkyl groups include, but are not limited to, groups derived from cyclopropane, cyclobutane, cyclopentane, cyclohexane, and the like. Preferably, the cycloalkyl group comprises from 3 to 10 ring atoms (C₃-C₁₀ cycloalkyl) and more preferably from 3 to 7 ring atoms (C₃-C₇ cycloalkyl).

[0039] “Cycloheteroalkyl,” by itself or as part of another substituent, refers to a saturated or unsaturated cyclic alkyl radical in which one or more carbon atoms (and optionally any associated hydrogen atoms) are independently replaced with the same or different heteroatom. Typical heteroatoms to replace the carbon atom(s) include, but are not limited to, N, P, O, S, Si, etc. Where a specific level of saturation is intended, the nomenclature “cycloheteroalkanyl” or “cycloheteroalkenyl” is used. Typical cycloheteroalkyl groups include, but are not limited to, groups derived from epoxides, azirines, thiiranes, imidazolidine, morpholine, piperazine, piperidine, pyrazolidine, pyrrolidone, quinuclidine, and the like. Preferably, the cycloheteroalkyl group comprises from 3 to 10 ring atoms (3-10 membered cycloheteroalkyl) and more preferably from 5 to 7 ring atoms (5-7 membered cycloheteroalkyl).

[0040] A cycloheteroalkyl group may be substituted at a heteroatom, for example, a nitrogen atom, with a lower alkyl group. As specific examples, N-methyl-imidazolidinyl, N-methyl-morpholinyl, N-methyl-piperazinyl, N-methyl-piperidinyl, N-methyl-pyrazolidinyl and N-methyl-pyrrolidinyl are included within the definition of “cycloheteroalkyl.” A cycloheteralkyl group may be attached to the remainder of the molecule via a ring carbon atom or a ring heteroatom.

[0041] “Dialkylamino” or “Monoalkylamino,” by themselves or as part of other substituents, refer to radicals of the formula —NRR and —NHR, respectively, where each R is independently selected from the group consisting of alkyl and cycloalkyl, as defined herein. Representative examples of dialkylamino groups include, but are not limited to, dimethylamino, methylethylamino, di-(1-methylethyl)amino, (cyclohexyl)(methyl)amino, (cyclohexyl)(ethyl)amino, (cyclohexyl)(propyl)amino and the like. Representative examples of monalkylamino groups include, but are not limited to, methylamino, ethylamino, propylamino, isopropylamino, cyclohexylamino, and the like.

[0042] “Halogen” or “Halo,” by themselves or as part of another substituent, refer to a fluoro, chloro, bromo and/or iodo radical.

[0043] “Haloalkyl,” by itself or as part of another substituent, refers to an alkyl group as defined herein in which one or more of the hydrogen atoms is replaced with a halo group. The term “haloalkyl” is specifically meant to include monohaloalkyls, dihaloalkyls, trihaloalkyls, etc. up to perhaloalkyls. The halo groups substituting a haloalkyl can be the same, or they can be different. For example, the expression “(C₁-C₂) haloalkyl” includes 1-fluoromethyl, 1-fluoro-2-chloroethyl, difluoromethyl, trifluoromethyl, 1-fluoroethyl, 1,1-difluoroethyl, 1,2-difluoroethyl, 1,1,1-trifluoroethyl, perfluoroethyl, etc.

[0044] “Haloalkyloxy,” by itself or as part of another substituent, refers to a group of the formula —O-haloalkyl, where haloalkyl is as defined herein.

[0045] “Heteroalkyl,” “Heteroalkanyl,” “Heteroalkenyl,” “Heteroalkynyl,” “Heteroalkyldiyl” and “Heteroalkyleno,” by themselves or as part of other substituents, refer to alkyl, alkanyl, alkenyl, alkynyl, alkyldiyl and alkyleno groups, respectively, in which one or more of the carbon atoms (and optionally any associated hydrogen atoms), are each, independently of one another, replaced with the same or different heteroatoms or heteroatomic groups. Typical heteroatoms or heteroatomic groups which can replace the carbon atoms include, but are not limited to, O, S, N, Si, —NH—, —S(O)—, —S(O)₂—, —S(O)NH—, —S(O)₂NH— and the like and combinations thereof. The heteroatoms or heteroatomic groups may be placed at any interior position of the alkyl, alkenyl or alkynyl groups. Examples of such heteroalkyl, heteroalkanyl, heteroalkenyl and/or heteroalkynyl groups include —CH₂—CH₂—O—CH₃, —CH₂—CH₂—NH—CH₃, —CH₂—CH₂—N(CH₃)—CH₃, —CH₂—S—CH₂, —CH₃, —CH₂—CH₂—S(O)—CH₃, —CH₂—CH₂—S(O)₂—CH₃, —CH═CH—O—CH₃, —CH₂—CH═N—O—CH₃, and —CH₂—CH₂—O—C═CH. For heteroalkyldiyl and heteroalkyleno groups, the heteratom or heteratomic group can also occupy either or both chain termini. For such groups, no orientation of the group is implied.

[0046] “Heteroaryl,” by itself or as part of another substituent, refers to a monovalent heteroaromatic radical derived by the removal of one hydrogen atom from a single atom of a parent heteroaromatic ring systems, as defined herein. Typical heteroaryl groups include, but are not limited to, groups derived from acridine, β-carboline, chromane, chromene, cinnoline, furan, imidazole, indazole, indole, indoline, indolizine, isobenzofuran, isochromene, isoindole, isoindoline, isoquinoline, isothiazole, isoxazole, naphthyridine, oxadiazole, oxazole, perimidine, phenanthridine, phenanthroline, phenazine, phthalazine, pteridine, purine, pyran, pyrazine, pyrazole, pyridazine, pyridine, pyrimidine, pyrrole, pyrrolizine, quinazoline, quinoline, quinolizine, quinoxaline, tetrazole, thiadiazole, thiazole, thiophene, triazole, xanthene, and the like. Preferably, the heteroaryl group comprises from 5 to 20 ring atoms (5-20 membered heteroaryl), more preferably from 5 to 10 ring atoms (5-10 membered heteroaryl). Preferred heteroaryl groups are those derived from furan, thiophene, pyrrole, benzothiophene, benzofuran, benzimidazole, indole, pyridine, pyrazole, quinoline, imidazole, oxazole, isoxazole and pyrazine.

[0047] “Heteroarylalkyl” by itself or as part of another substituent refers to an acyclic alkyl group in which one of the hydrogen atoms bonded to a carbon atom, typically a terminal or sp³ carbon atom, is replaced with a heteroaryl group. Where specific alkyl moieties are intended, the nomenclature heteroarylalkanyl, heteroarylakenyl and/or heteroarylalkynyl is used. In preferred embodiments, the heteroarylalkyl group is a 6-21 membered heteroarylalkyl, e.g., the alkanyl, alkenyl or alkynyl moiety of the heteroarylalkyl is (C₁-C₆) alkyl and the heteroaryl moiety is a 5-15-membered heteroaryl. In particularly preferred embodiments, the heteroarylalkyl is a 6-13 membered heteroarylalkyl, e.g., the alkanyl, alkenyl or alkynyl moiety is (C1-C3) alkyl and the heteroaryl moiety is a 5-10 membered heteroaryl.

[0048] “Parent Aromatic Ring System” refers to an unsaturated cyclic or polycyclic ring system having a conjugated π electron system. Specifically included within the definition of “parent aromatic ring system” are fused ring systems in which one or more of the rings are aromatic and one or more of the rings are saturated or unsaturated, such as, for example, fluorene, indane, indene, phenalene, etc. Typical parent aromatic ring systems include, but are not limited to, aceanthrylene, acenaphthylene, acephenanthrylene, anthracene, azulene, benzene, chrysene, coronene, fluoranthene, fluorene, hexacene, hexaphene, hexalene, as-indacene, s-indacene, indane, indene, naphthalene, octacene, octaphene, octalene, ovalene, penta-2,4-diene, pentacene, pentalene, pentaphene, perylene, phenalene, phenanthrene, picene, pleiadene, pyrene, pyranthrene, rubicene, triphenylene, trinaphthalene and the like.

[0049] “Parent Heteroaromatic Ring System” refers to a parent aromatic ring system in which one or more carbon atoms (and optionally any associated hydrogen atoms) are each independently replaced with the same or different heteroatom. Typical heteroatoms to replace the carbon atoms include, but are not limited to, N, P, O, S, Si, etc. Specifically included within the definition of “parent heteroaromatic ring system” are fused ring systems in which one or more of the rings are aromatic and one or more of the rings are saturated or unsaturated, such as, for example, benzodioxan, benzofuran, chromane, chromene, indole, indoline, xanthene, etc. Typical parent heteroaromatic ring systems include, but are not limited to, arsindole, carbazole, β-carboline, chromane, chromene, cinnoline, furan, imidazole, indazole, indole, indoline, indolizine, isobenzofuran, isochromene, isoindole, isoindoline, isoquinoline, isothiazole, isoxazole, naphthyridine, oxadiazole, oxazole, perimidine, phenanthridine, phenanthroline, phenazine, phthalazine, pteridine, purine, pyran, pyrazine, pyrazole, pyridazine, pyridine, pyrimidine, pyrrole, pyrrolizine, quinazoline, quinoline, quinolizine, quinoxaline, tetrazole, thiadiazole, thiazole, thiophene, triazole, xanthene and the like.

[0050] “Pharmaceutically acceptable salt” refers to a salt of a compound of the invention which is made with counterions understood in the art to be generally acceptable for pharmaceutical uses and which possesses the desired pharmacological activity of the parent compound. Such salts include: (1) acid addition salts, formed with inorganic acids such as hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid, phosphoric acid, and the like; or formed with organic acids such as acetic acid, propionic acid, hexanoic acid, cyclopentanepropionic acid, glycolic acid, pyruvic acid, lactic acid, malonic acid, succinic acid, malic acid, maleic acid, fumaric acid, tartaric acid, citric acid, benzoic acid, 3-(4-hydroxybenzoyl) benzoic acid, cinnamic acid, mandelic acid, methanesulfonic acid, ethanesulfonic acid, 1,2-ethane-disulfonic acid, 2-hydroxyethanesulfonic acid, benzenesulfonic acid, 4-chlorobenzenesulfonic acid, 2-naphthalenesulfonic acid, 4-toluenesulfonic acid, camphorsulfonic acid, 4-methylbicyclo[2.2.2]-oct-2-ene-1-carboxylic acid, glucoheptonic acid, 3-phenylpropionic acid, trimethylacetic acid, tertiary butylacetic acid, lauryl sulfuric acid, gluconic acid, glutamic acid, hydroxynaphthoic acid, salicylic acid, stearic acid, muconic acid and the like; or (2) salts formed when an acidic proton present in the parent compound is replaced by a metal ion, e.g., an alkali metal ion, an alkaline earth ion, or an aluminum ion; or coordinates with an organic base such as ethanolamine, diethanolamine, triethanolamine, N-methylglucamine, morpholine, piperidine, dimethylamine, diethylamine and the like. Also included are salts of amino acids such as arginates and the like, and salts of organic acids like glucurmic or galactunoric acids and the like (see, e.g., Berge et al., 1977, J. Pharm. Sci. 66:1-19).

[0051] “Pharmaceutically acceptable vehicle” refers to a diluent, adjuvant, excipient or carrier with which a compound of the invention is administered.

[0052] “Protecting group” refers to a group of atoms that, when attached to a reactive functional group in a molecule, mask, reduce or prevent the reactivity of the functional group. Typically, a protecting group may be selectively removed as desired during the course of a synthesis. Examples of protecting groups can be found in Greene and Wuts, Protective Groups in Organic Chemistry, 3^(rd) Ed., 1999, John Wiley & Sons, NY and Harrison et al., Compendium of Synthetic Organic Methods, Vols. 1-8, 1971-1996, John Wiley & Sons, NY. Representative amino protecting groups include, but are not limited to, formyl, acetyl, trifluoroacetyl, benzyl, benzyloxycarbonyl (“CBZ”), tert-butoxycarbonyl (“Boc”), trimethylsilyl (“TMS”), 2-trimethylsilyl-ethanesulfonyl (“SES”), trityl and substituted trityl groups, allyloxycarbonyl, 9-fluorenylmethyloxycarbonyl (“FMOC”), nitro-veratryloxycarbonyl (“NVOC”) and the like. Representative hydroxyl protecting groups include, but are not limited to, those where the hydroxyl group is either acylated (e.g., methyl and ethyl esters, acetate or propionate groups or glycol esters) or alkylated such as benzyl and trityl ethers, as well as alkyl ethers, tetrahydropyranyl ethers, trialkylsilyl ethers (e.g., TMS or TIPPS groups) and allyl ethers.

[0053] “Prodrug” refers to a derivative of an active compound (drug) that undergoes a transformation under the conditions of use, such as within the body, to release an active drug. Prodrugs are frequently, but not necessarily, pharmacologically inactive until converted into the active drug. Prodrugs are typically obtained by masking a functional group in the drug believed to be in part required for activity with a progroup (defined below) to form a promoiety which undergoes a transformation, such as cleavage, under the specified conditions of use to release the functional group, and hence the active drug. The cleavage of the promoiety may proceed spontaneously, such as by way of a hydrolysis reaction, or it may be catalyzed or induced by another agent, such as by an enzyme, by light, by acid, or by a change of or exposure to a physical or environmental parameter, such as a change of temperature. The agent may be endogenous to the conditions of use, such as an enzyme present in the cells to which the prodrug is administered or the acidic conditions of the stomach, or it may be supplied exogenously.

[0054] A wide variety of progroups, as well as the resultant promoieties, suitable for masking functional groups in active compounds to yield prodrugs are well-known in the art. For example, a hydroxyl functional group may be masked as a sulfonate, ester or carbonate promoiety, which may be hydrolyzed in vitro to provide the hydroxyl group. An amino functional group may be masked as an amide, imine, phosphinyl, phosphonyl, phosphoryl, phosphate ester, phosphate ester salt or sulfenyl promoiety, which may be hydrolyzed in vivo to provide the amino group. A carboxyl group may be masked as an ester (including silyl esters and thioesters), amide or hydrazide promoiety, which may be hydrolyzed in vivo to provide the carboxyl group. Other specific examples of suitable progroups and their respective promoieties will be apparent to those of skill in the art.

[0055] “Progroup” refers to a type of protecting group that, when used to mask a functional group within an active drug to form a promoiety, converts the drug into a prodrug. Progroups are typically attached to the functional group of the drug via bonds that are cleavable under specified conditions of use. Thus, a progroup is that portion of a promoiety that cleaves to release the functional group under the specified conditions of use. As a specific example, an amide promoiety of the formula —NH—C(O)CH₃ comprises the progroup —C(O)CH₃.

[0056] “Substituted,” when used to modify a specified group or radical, means that one or more hydrogen atoms of the specified group or radical are each, independently of one another, replaced with the same or different substituent(s). Substituent groups useful for substituting saturated carbon atoms in the specified group or radical include, but are not limited to —R^(a), halo, —O⁻, ═O, —OR^(b), —SR^(b), —S⁻, ═S, —NR^(c)R^(c), ═NR^(b), ═N—OR^(b), trihalomethyl, —CF₃, —CN, —OCN, —SCN, —NO, —NO₂, ═N₂, —N₃, —S(O)₂R^(b), —S(O)₂O⁻, —S(O)₂OR^(b), —OS(O)₂R^(b), —OS(O)₂O⁻, —OS(O)₂OR^(b), —P(O)(O⁻)₂, —P(O)(OR^(b))(O⁻), —P(O)(OR^(b))(OR^(b)), —C(O)R^(b), —C(S)R^(b), —C(NR^(b))R^(b), —C(O)O⁻, —C(O)OR^(b), —C(S)OR^(b), —C(O)NR^(c)R^(c), —C(NR^(b))NR^(c)R^(c), —OC(O)R^(b), —OC(S)R^(b), —OC(O)O⁻, —OC(O)OR^(b), —OC(S)OR^(b), —NR^(b)C(O)R^(b), —NR^(b)C(S)R^(b), —NR^(b)C(O)O⁻, —NR^(b)C(O)OR^(b), —NR^(b)C(S)OR^(b), —NR^(b)C(O)NR^(c)R^(c), —NR^(b)C(NR^(b))R^(b) and —NR^(b)C(NR^(b))NR^(c)R^(c), where R^(a) is selected from the group consisting of alkyl, cycloalkyl, heteroalkyl, cycloheteroalkyl, aryl, arylalkyl, heteroaryl and heteroarylalkyl; each R^(b) is independently hydrogen or R^(a); and each R^(c) is independently R^(b) or alternatively, the two R^(c)s are taken together with the nitrogen atom to which they are bonded form a 5-, 6- or 7-membered cycloheteroalkyl which may optionally include from 1 to 4 of the same or different additional heteroatoms selected from the group consisting of O, N and S. As specific examples, —NR^(c)R^(c) is meant to include —NH₂, —NH-alkyl, N-pyrrolidinyl and N-morpholinyl.

[0057] Similarly, substituent groups useful for substituting unsaturated carbon atoms in the specified group or radical include, but are not limited to, —R^(a), halo, —O⁻, —OR^(b), —SR^(b), —S⁻, —NR^(c)R^(c), trihalomethyl, —CF₃, —CN, —OCN, —SCN, —NO, —NO₂, —N₃, —S(O)₂R^(b), —S(O)₂O⁻, —S(O)₂OR^(b), —OS(O)₂R^(b), —OS(O)₂O⁻, —OS(O)₂OR^(b), —P(O)(O⁻)₂, —P(O)(OR^(b))(O⁻), —P(O)(OR^(b))(OR^(b)), —C(O)R^(b), —C(S)R^(b), —C(NR^(b))R^(b), —C(O)O⁻, —C(O)OR^(b), —C(S)OR^(b), —C(O)NR^(c)R^(c), —C(NR^(b))NR^(c)R^(c), —OC(O)R^(b), —OC(S)R^(b), —OC(O)O⁻, —OC(O)OR^(b), —OC(S)OR^(b), —NR^(b)C(O)R^(b), —NR^(b)C(S)R^(b), —NR^(b)C(O)O⁻, —NR^(b)C(O)OR^(b), —NR^(b)C(S)OR^(b), —NR^(b)C(O)NR^(c)R^(c), —NR^(b)C(NR^(b))R^(b) and —NR^(b)C(NR^(b))NR^(c)R^(c), where R^(a), R^(b) and R^(c) are as previously defined.

[0058] Substituent groups useful for substituting nitrogen atoms in heteroalkyl and cycloheteroalkyl groups include, but are not limited to, —R^(a), —O⁻, —OR^(b), —SR^(b), —S⁻, —NR^(c)R^(c), trihalomethyl, —CF₃, —CN, —NO, —NO₂, —S(O)₂R^(b), —S(O)₂O⁻, —S(O)₂OR^(b), —OS(O)₂R^(b), —OS(O)₂O⁻, —OS(O)₂OR^(b), —P(O)(O⁻)₂, —P(O)(OR^(b))(O⁻), —P(O)(OR^(b))(OR^(b)), —C(O)R^(b), —C(S)R^(b), —C(NR^(b))R^(b), —C(O)OR^(b), —C(S)OR^(b), —C(O)NR^(c)R^(c), —C(NR^(b))NR^(c)R^(c), —OC(O)R^(b), —OC(S)R^(b), —OC(O)OR^(b), —OC(S)OR^(b), —NR^(b)C(O)R^(b), —NR^(b)C(S)R^(b), —NR^(b)C(O)OR^(b), —NR^(b)C(S)OR^(b), —NR^(b)C(O)NR^(c)R^(c), —NR^(b)C(NR^(b))R^(b) and —NR^(b)C(NR^(b))NR^(c)R^(c), where R^(a), R^(b) and R^(c) are as previously defined.

[0059] Substituent groups from the above lists useful for substituting other specified groups or atoms will be apparent to those of skill in the art.

[0060] The substituents used to substitute a specified group can be further substituted, typically with one or more of the same or different groups selected from the various groups specified above.

[0061] “Sulfamoyl,” by itself or as part of another substituent, refers to a radical of the formula —S(O)₂NR′R″, where R′ and R″ are each, independently of one another, selected from the group consisting of hydrogen, alkyl and cycloalkyl as defined herein, or alternatively, R′ and R″, taken together with the nitrogen atom to which they are bonded, form a 5-, 6- or 7-membered cycloheteroalkyl ring as defined herein, which may optionally include from 1 to 4 of the same or different additional heteroatoms selected from the group consisting of O, S and N.

[0062] 5.2 The Compounds

[0063] The invention provides substituted diphenyl heterocycle compounds that are potent inhibitors of HCV replication and/or proliferation. In one embodiment, the compounds of the invention are substituted diphenyl isoxazoles, pyrazoles and oxadiazoles according to structural formula (I):

[0064] including the pharmaceutically acceptable salts, hydrates, solvates, N-oxides and prodrugs thereof, wherein:

[0065] X and Y are each, independently of one another, N or O, provided that X and Y are not both O;

[0066] Z is N or —CH—, provided that Z is —CH— when X and Y are both N;

[0067] R², R³, R⁴, R⁵, R⁸, R⁹, R¹⁰ and R¹³ are each, independently of one another, selected from the group consisting of hydrogen, —OH, —SH, —CN, —NO₂, halo, fluoro, chloro, bromo, iodo, lower alkyl, substituted lower alkyl, lower heteroalkyl, substituted lower heteroalkyl, cycloalkyl, substituted cycloalkyl, cycloheteroalkyl, substituted cycloheteroalkyl, lower haloalkyl, monohalomethyl, dihalomethyl, trihalomethyl, trifluoromethyl, lower alkylthio, substituted lower alkylthio, lower alkoxy, substituted lower alkoxy, methoxy, substituted methoxy, lower heteroalkoxy, substituted lower heteroalkoxy, cycloalkoxy, substituted cycloalkoxy, cycloheteroalkoxy, substituted cycloheteroalkoxy, lower haloalkoxy, monohalomethoxy, dihalomethoxy, trihalomethoxy, trifluoromethoxy, amino, lower di- or mono alkylamino, substituted lower di- or monoalkyl amino, aryl, substituted aryl, aryloxy, substituted aryloxy, phenoxy, substituted phenoxy, arylalkyl, substituted arylalkyl, arylalkyloxy, substituted arylalkyloxy, benzyl, benzyloxy, heteroaryl, substituted heteroaryl, heteroaryloxy, substituted heteroaryloxy, heteroarylalkyl, substituted heteroarylalkyl, heteroarylalkyloxy, substituted heteroarylalkyloxy, carboxyl, lower alkoxycarbonyl, substituted lower alkoxycarbonyl, aryloxycarbonyl, substituted aryloxycarbonyl, arylalkyloxycarbonyl, substituted arylalkyloxycarbonyl, carbamate, substituted carbamate, carbamoyl, substituted carbamoyl, sulfamoyl, substituted sulfamoyl and a group of the formula -L-R¹⁴, where “L” is a linker and R¹⁴ is cycloalkyl, substituted cycloalkyl, cycloheteroalkyl or substituted cycloheteroalkyl;

[0068] R¹¹ is hydrogen or lower alkyl;

[0069] R¹² is dihalomethyl;

[0070] L is a linker; and

[0071] R¹⁶ is selected from the group consisting of hydrogen, lower alkyl, substituted lower alkyl, lower heteroalkyl, substituted lower heteroalkyl, cycloalkyl, substituted cycloalkyl, cycloheteroalkyl, substituted cycloheteroalkyl, lower haloalkyl, monohalomethyl, dihalomethyl, trihalomethyl, trifluoromethyl, lower alkylthio, substituted lower alkylthio, lower alkoxy, substituted lower alkoxy, lower heteroalkoxy, substituted lower heteroalkoxy, cycloalkoxy, substituted cycloalkoxy, cycloheteroalkoxy, substituted cycloheteroalkoxy, lower haloalkoxy, aryl, substituted aryl, aryloxy, substituted aryloxy, arylalkyl, substituted arylalkyl, arylalkyloxy, substituted arylalkyloxy, benzyl, benzyloxy, heteroaryl, substituted heteroaryl, heteroaryloxy, substituted heteroaryloxy, heteroarylalkyl, substituted heteroarylalkyl, heteroarylalkyloxy, substituted heteroarylalkyloxy, carboxyl, lower alkoxycarbonyl, substituted lower alkoxycarbonyl, aryloxycarbonyl, substituted aryloxycarbonyl, arylalkyloxycarbonyl, substituted arylalkyloxycarbonyl, carbamate, substituted carbamate, carbamoyl, substituted carbamoyl, sulfamoyl, substituted sulfamoyl and a group of the formula -L-R¹⁴, where “L” is a linker and R¹⁴ is cycloalkyl, substituted cycloalkyl, cycloheteroalkyl or substituted cycloheteroalkyl, with the provisios that

[0072] for (A), R¹⁶, is not a lower alkyl group;

[0073] for (B), R¹⁶, is not a cycloheteroalkyl; and

[0074] for (C), R¹⁶ is not hydrogen.

[0075] In the compounds of formula (1), one alternative group for substituents R², R³, R⁴, R⁵, R⁸, R⁹, R¹⁰ and R¹³ is a group of the formula -L-R¹⁴, where “L” is a linker. The linker may be any group of atoms suitable for attaching the R¹⁴ moiety to the illustrated phenyl group. Suitable linkers include, but are not limited to, moieties selected from the group consisting of —(CH₂)₁₋₆—, O, S, —C(O)—, —SO₂—, —NH—, —NHC(O)—, —C(O)—, —SO₂NH— and combinations thereof. In one embodiment, “L” is selected from the group consisting of —(CH₂)₁₋₃—, —O—(CH₂)₁₋₃—, —S—(CH₂)₁₋₃— and —SO₂—.

[0076] In such L-R¹⁴ moieties, R¹⁴ is as defined above. In one embodiment, R¹⁴ is selected from the group consisting of morpholinyl, N-morpholinyl, piperazinyl, N-piperazinyl, N-methyl-N-piperazinyl, imidazolinyl, N-imidazolidinyl, N-methyl-N-imidazolidinyl, piperidinyl, N-piperidinyl, pyrrolidinyl, N-pyrrolidinyl, pyrazolidinyl, N-pyrazolidinyl and N-methyl-N-pyrazolidinyl.

[0077] In the compounds of formula (1), specific examples of substituent groups when R², R³, R⁴, R⁵, R⁸, R⁹, R¹⁰ and/or R¹³ are a substituted alkyl group include methyl, ethyl or propyl groups substituted with a single substituent selected from the group consisting of halo, fluoro, chloro, bromo, hydroxy, lower alkoxy, —CN, —NO₂, —C(O)OR^(e), OC(O)OR^(e), —C(O)NR^(f)R^(g) and —OC(O)NR^(f)R^(g), where each R^(e) is independently hydrogen, lower alkyl or cycloalkyl; and R^(f) and R^(g) are each, independently of one another, selected from the group consisting of hydrogen, lower alkyl and cycloalkyl or, alternatively, R^(f) and R^(g), taken together with the nitrogen atom to which they are bonded form a 5-, 6- or 7-membered cycloheteroalkyl ring which may optionally include from 1 to 4 of the same or different additional heteroatoms selected from the group consisting of O, S and N. Further specific examples of substituent groups when R², R³, R⁴, R⁵, R⁸, R⁹, R¹⁰ and/or R¹³ are a substituted alkyl group include —CH₂—R¹⁷, where R¹⁷ is halo, Br, —OH, lower alkoxy, —CN, NO₂, —C(O)R^(e), —OC(O)R^(e), —C(O)NR^(f)R^(g) and —OC(O)NR^(f)R^(g), where R^(e), R^(f) and R^(g) are as defined above.

[0078] Specific examples of substituent groups when R², R³, R⁴, R⁵, R⁸, R⁹, R¹⁰ and/or R¹³ are a substituted lower alkoxy group include lower alkoxy groups substituted at the terminal methyl group with a substituent selected from the group consisting of halo, —OH, —CN, —NO₂, —C(O)R^(e), —OC(O)R^(e), —C(O)NR^(f)R^(g) and —OC(O)NR^(f)R^(g), where R^(e), R^(f) and R^(g) are as previously defined.

[0079] Specific examples of substituent groups when R², R³, R⁴, R⁵, R⁸, R⁹, R¹⁰ and/or R¹³ are aryl or heteroaryl groups include phenyl, 5- or 6-membered heteroaryl, furanyl, imidazolyl, isothiazolyl, isoxazolyl, pyranyl, pyrazinyl, pyrazolyl, pyridazinyl, pyridinyl, pyrimidinyl, pyrrolyl and thiophenyl. The various heteroaryl groups may be connected to the remainder of the molecule via any available carbon atom or heteroatom. In one embodiment, heteroaryl groups containing ring nitrogen atoms are attached to the remainder of the molecule via a ring nitrogen atom. The heteroaryl groups may also be substituted at one or more ring nitrogen atoms with a lower alkyl, lower alkanyl or methyl group.

[0080] Specific examples of substituent groups when R², R³, R⁴, R⁵, R⁸, R⁹, R¹⁰ and/or R¹³ are carbamoyl or substituted carbamoyl groups include groups of the formula —C(O)NR^(h)R^(i), where R^(h) and R^(i) are taken together with the nitrogen atom to which they are bonded to form a 5- or 6-membered cycloheteroalkyl ring which may optionally include from 1 to 4 of the same or different additional heteratoms selected from O, S and N and which is optionally substituted at one or more ring carbon or heteratoms with a substituent selected from the group consisting of lower alkyl, lower alkanyl, methyl, —OH, ═O, —C(O)OR^(e), —C(O)NR^(f)R^(g), —OC(O)R^(e), —OC(O)NR^(f)R^(g) and aryl, where R^(e), R^(f) and R^(g) are as previously defined. Further specific examples include sulfamoyl or substituted sulfamoyl groups of the formula —C(O)NR^(h)R^(i), where NR^(h)R^(i) is selected from the group consisting of N-methyl-piperazine, 4-oxo-piperidine, 4-amino-piperdine, 4-(mono-or dialkylamino) piperidine and 4-hydroxy-piperdine.

[0081] Specific examples of substituent groups when R², R³, R⁴, R⁵, R⁸, R⁹, R¹⁰ and/or R¹³ are a substituted mono- or dialkylamino group include those mono or dialkylamino groups in which at least one of the alkyl moieties is substituted, preferably at a terminal methyl group, with a substituent selected from the group consisting of —OH and —NR^(e)R^(e), where each R^(e) is as previously defined. Specific examples of such substituted mono- and dialkylamino groups include —N(R^(k))—(CH₂)₁₋₃—NR^(k)R^(k) and —N(R^(k))—(CH₂)₁₋₃—OR^(k), where each R^(k) is independently hydrogen, lower alkyl or methyl.

[0082] Specific examples of substituent groups when R², R³, R⁴, R⁵, R⁸, R⁹, R¹⁰ and/or R¹³ is a cycloheteroalkyl or substituted cycloheteroalkyl group include 5- or 6-membered cycloheteroalkyl, imidazolidinyl, morpholinyl, piperazinyl, piperadinyl, pyrazolidinyl and pyrrolidinyl, wherein the ring may be optionally substituted at a ring carbon atom with a substituent selected from the group consisting of —OR^(e), —NR^(f)R^(g) and —C(O)OR^(e), where R^(e), R^(f) and R^(g) are as previously defined. The cycloheteroalkyl or substituted cycloheteroalkyl may be attached to the remainder of the molecule via any available ring carbon or heteroatom. In one embodiment, the cycloheteroalkyl or substituted cycloheteroalkyl is attached to the remainder of the molecule via a ring nitrogen atom. Further specific examples of substituted cycloheteroalkyls suitable as R², R³, R⁴, R⁵, R⁸, R⁹, R¹⁰ and/or R¹³ substituents include N-piperidinyl substituted at the 4-position, or N-pyrrolidinyl substituted at the 3-position, with a lower alkoxycarbonyl, amino, mono- or dialkylamino or N-piperidinyl group.

[0083] Additional specific examples of R², R³, R⁴, R⁵, R⁸, R⁹, R¹⁰ and R¹³, as well as specific combinations of substituents for the “A” and “C” phenyl rings are provided in TABLE 1, infra.

[0084] In one embodiment of the compounds of structural formula (I), Z is —CH— such that the compounds are isoxazoles or pyrazoles. In another embodiment of the compounds of structural formula (I), Z is N such that the compounds are oxadiazoles. In another embodiment, the compounds of structural formula (I) are isoxazoles.

[0085] In another embodiment of the compounds of structural formula (I), three of R⁸, R⁹, R¹⁰ and R¹³ are hydrogen. In a specific embodiment, R⁹, R¹⁰ and R¹³ are each hydrogen.

[0086] In yet another embodiment of the compounds of structural formula (I), R⁸, R⁹, R¹⁰ and R¹³ are each, independently of one another, selected from the group consisting of hydrogen, halo, fluoro, chloro, bromo, iodo, sulfamoyl, lower alkylthio, lower haloalkyl, monohalomethyl, dihalomethyl, trihalomethyl, trifluoromethyl and -L-R¹⁴, where L is —(CH₂)₁₋₃— or —O—(CH₂)₁₋₃— and R¹⁴ is a 5- or 6-membered cycloheteroalkyl or N-morpholinyl. In one specific embodiment, three of R⁸, R⁹, R¹⁰ and R¹³ are hydrogen. In another specific embodiment, R⁹, R¹⁰ and R¹³ are each hydrogen.

[0087] In yet another embodiment of the compounds of structural formula (I), R² is selected from the group consisting of —OH, —NO₂, halo, fluoro, chloro, bromo, iodo, lower alkyl, methyl, lower heteroalkyl, (C3-C6) cycloalkyl, 5- or 6-membered cycloheteroalkyl, N-morpholinyl, N-methyl-N-piperazinyl, N-piperadinyl, substituted N-piperadinyl, 4-(N-piperadinyl)-N-piperadinyl, 4-amino-N-piperadinyl, lower alkoxy, methoxy, ethoxy, lower alkylthio, methylthio, lower haloalkyl, monohalomethyl, dihalomethyl, trihalomethyl, trifluoromethyl, lower haloalkyloxy, monohalomethoxy, dihalomethoxy, trihalomethoxy, trifluoromethoxy, aryl, phenyl, arylalkyl, benzyl, aryloxy, phenoxy, arylalkyloxy, benzyloxy, 5- or 6-membered heteroaryl, lower alkyloxycarbonyl, sulfamoyl and -L-R¹⁴, where L is —(CH₂)₁₋₃— or —O—(CH₂)₁₋₃— and R¹⁴ is a 5- or 6-membered cycloheteroalkyl or N-morpholinyl.

[0088] In another embodiment of the compounds of structural formula (I), R³ and R⁵ are each, independently of one another, selected from the group consisting of hydrogen, halo, fluoro, chloro, lower alkoxyl, lower alkanyloxy, carboxyl, lower alkanyloxycarbonyl, monohalomethyl, dihalomethyl, trihalomethyl and trifluoromethyl.

[0089] In still another embodiment of the compounds of structural formula (1), R⁴ is selected from the group consisting of hydrogen, lower dialkylamino, lower dialkaylamino, dimethylamino, halo, fluoro, chloro and -L-R¹⁴, where L is —O—(CH₂)₁₋₃— and R¹⁴ is 6-membered cycloheteroalkyl, N-morpholinyl or N-piperazinyl.

[0090] In yet another embodiment of the compounds of structural formula (I), R³, R⁴, R⁵, R⁸, R⁹, R¹⁰ and R¹³ are each hydrogen. Preferably, in this embodiment, R² is selected from the group consisting of hydroxyl, chloro, fluoro, methoxy, ethoxy, trifluoromethyl, trifluoromethoxy and N-morpholinyl. In a specific embodiment, R² is chloro. In another specific embodiment, R² is fluoro. Preferably, in the above embodiments, Z is —CH— and/or X is N and Y is O.

[0091] In one embodiment of the compounds of struatural formula (I), R³, R⁴, R⁵, R⁸, R⁹, R¹⁰ and R¹³ are each hydrogen, R² is selected from the group consisting of hydroxyl, chloro, fluoro, methoxy, ethoxy, trifluoromethyl, trifluoromethoxy, R⁶ is

[0092] and R¹⁶ is selected from the group consisting of cycloalkyl, lower alkyl, aryl, substituted aryl and cycloheteroalkyl.

[0093] In another embodiment of the compounds of struatural formula (I), R³, R⁴, R⁵, R⁸, R⁹, R¹⁰ and R¹³ are each hydrogen, R² is selected from the group consisting of hydroxyl, chloro, fluoro, methoxy, ethoxy, trifluoromethyl, trifluoromethoxy, R⁶ is

[0094] and R¹⁶ is selected from the group consisting of hydrogen, carboxyl, carbamoyl, and alkoxycarbonyl. In a specific embodiment, R² is chloro. Preferably, in the above embodiments, Z is —CH—, X is N and Y is O.

[0095] In still another embodiment of the compounds of struatural formula (I), R³, R⁴, R⁵, R⁸, R⁹, R¹⁰ and R¹³ are each hydrogen, R² is selected from the group consisting of hydroxyl, chloro, fluoro, methoxy, ethoxy, trifluoromethyl, trifluoromethoxy, R⁶ is

[0096] and R¹⁶ is selected from the group consisting of arylalkyl, substituted arylalkyl, aryl and substituted aryl. In a specific embodiment, R² is chloro. Preferably, in the above embodiments, Z is —CH—, X is N and Y is O.

[0097] In still yet another embodiment of the compounds of struatural formula (I), R³, R⁴, R⁵, R⁸, R⁹, R¹⁰ and R¹³ are each hydrogen, R² is selected from the group consisting of hydroxyl, chloro, fluoro, methoxy, ethoxy, trifluoromethyl, trifluoromethoxy, R⁶ is

[0098] and R¹⁶ is selected from the group consisting of arylalkyl, substituted arylalkyl, aryl, substituted aryl, alkylamino, alkyldi- or monoalkylamino, heteroarylalkyl, substituted heteroarylalkyl, cycloheteroalkylalkyl and substituted cycloheteroalkylalkyl. In a specific embodiment, R² is chloro. Preferably, in the above embodiments, Z is —CH—, X is N and Y is O.

[0099] In another embodiment of the compounds of struatural formula (1), R³, R⁴, R⁵, R⁸, R⁹, R¹⁰ and R¹³ are each hydrogen, R² is selected from the group consisting of hydroxyl, chloro, fluoro, methoxy, ethoxy, trifluoromethyl, trifluoromethoxy, R⁶ is

[0100] and R¹⁶ is selected from the group consisting of carbamoyl, lower alkoxycarbonyl, aryl sulfone and alkyl sulfone. In a specific embodiment, R² is chloro. Preferably, in the above embodiments, Z is —CH—, X is N and Y is O.

[0101] In still another embodiment of the compounds of struatural formula (1), R³, R⁴, R⁵, R⁸, R⁹, R¹⁰ and R¹³ are each hydrogen, R² is selected from the group consisting of hydroxyl, chloro, fluoro, methoxy, ethoxy, trifluoromethyl, trifluoromethoxy, R⁶ is

[0102] and R¹⁶ is selected from the group consisting of aryl, substituted aryl, arylalkyl, substituted arylalkyl and lower alkoxycarbonyl. In a specific embodiment, R² is chloro. Preferably, in the above embodiments, Z is —CH—, X is N and Y is O.

[0103] In still yet another embodiment of the compounds of struatural formula (I), R³, R⁴, R⁵, R⁸, R⁹, R¹⁰ and R¹³ are each hydrogen, R² is selected from the group consisting of hydroxyl, chloro, fluoro, methoxy, ethoxy, trifluoromethyl, trifluoromethoxy, R⁶ is

[0104] and R¹⁶ is selected from the group consisting of lower alkyl, substituted lower alkyl, heteroarylalkyl, substituted heteoarylalkyl, alkylalkoxycarbonyl and substituted alkylalkoxycarbonyl. In a specific embodiment, R² is chloro. Preferably, in the above embodiments, Z is —CH—, X is N and Y is O.

[0105] In still another embodiment, the compounds of the invention are compounds according to structural formulae (Ia), (Ib), (Ic) and/or (Id):

[0106] including the pharmaceutically acceptable salts, hydrates, solvates and N-oxides thereof, wherein X, Y, R², R³, R⁴, R⁵, R⁶, R¹¹ and R¹² are as previously defined for structural formula (I) and subject to the same provisos. In one embodiment, the compounds of structural formula (Ia), (Ib), (Ic) and/or (Id) have one or more features selected from the group consisting of:

[0107] X is N and Y is O;

[0108] X is O and Y is N;

[0109] R¹¹ is hydrogen or methyl;

[0110] R² is selected from the group consisting of hydrogen, hydroxyl, halo, lower alkyl, methyl, lower alkoxy, methoxy, monohalomethyl, dihalomethyl, trihalomethyl, trifluoromethyl, trifluoromethoxy, and N-morpholinyl;

[0111] R³ and R⁵ are each hydrogen; and

[0112] R⁴ is hydrogen or -L-R¹⁴, where L is —(CH₂)₁₋₃— and R¹⁴ is 6-membered cycloheteroalkyl, preferably comprising from 1 to 2 of the same or different heteroatoms selected from O and N.

[0113] Exemplary compounds of the invention are provided in TABLE 1. Also included in the invention are the various regioisomers of the compounds described herein, including the various regioisomers of the compounds of structural formula (I), (Ia), (Ib), (Ic), (Id) and TABLE 1.

[0114] Those of skill in the art will appreciate that the compounds of the invention described herein may include functional groups that can be masked with progroups to create prodrugs. Such prodrugs are usually, but need not be, pharmacologically inactive until converted into their active drug form. In the prodrugs of the invention, any available functional moiety may be masked with a progroup to yield a prodrug. Myriad progroups suitable for masking such functional groups to yield promoieties that are cleavable under the desired conditions of use are known in the art. Specific examples are described supra.

[0115] 5.3 Methods of Synthesis

[0116] The compounds of the invention may be obtained via synthetic methods illustrated in FIGS. 1-13. It should be understood that in FIGS. 1-13, R², R³, R⁴, R⁵, R⁶, R⁷, R⁸, R⁹, R¹⁰, R¹¹, R¹² and R¹³ are as previously defined for structural formula (I).

[0117] Starting materials useful for preparing compounds of the invention and intermediates thereof are commercially available or can be prepared by well-known synthetic methods (see, e.g., Harrison et al., “Compendium of Synthetic Organic Methods”, Vols. 1-8 (John Wiley and Sons, 1971-1996); “Beilstein Handbook of Organic Chemistry,” Beilstein Institute of Organic Chemistry, Frankfurt, Germany; Feiser et al., “Reagents for Organic Synthesis,” Volumes 1-21, Wiley Interscience; Trost et al., “Comprehensive Organic Synthesis,” Pergamon Press, 1991; “Theilheimer's Synthetic Methods of Organic Chemistry,” Volumes 1-45, Karger, 1991; March, “Advanced Organic Chemistry,” Wiley Interscience, 1991; Larock “Comprehensive Organic Transformations,” VCH Publishers, 1989; Paquette, “Encyclopedia of Reagents for Organic Synthesis,” 3d Edition, John Wiley & Sons, 1995). Other methods for synthesis of the compounds described herein and/or starting materials are either described in the art or will be readily apparent to the skilled artisan. Alternatives to the reagents and/or protecting groups illustrated in FIGS. 1-7 may be found in the references provided above and in other compendiums well known to the skilled artisan. Guidance for selecting suitable protecting groups can be found, for example, in Greene & Wuts, “Protective Groups in Organic Synthesis,” Wiley Interscience, 1999. Accordingly, the synthetic methods and strategy presented herein are illustrative rather than comprehensive.

[0118] One method for synthesizing substituted diphenyl isoxazoles according to structural formula (I) (when Z is —CH—) is provided in FIG. 1A. Referring to FIG. 1A, aldol condensation of methyl ketone 201 with benzaldehyde 203 under basic conditions, followed by in situ dehydration, provides α-β unsaturated enone 205, which may be readily converted to isoxazole 207 by treatment with hydroxylamine. Reduction of 207 yields the amino isoxazole 209, which may be optionally alkylated with R¹¹-halide and acylated with LG-C(O)—R¹² yield 211. In FIG. 1A and throughout the remaining FIGS. 2-7, “LG” represents a leaving or activating group, regardless of the moiety to which it is attached. Myriad suitable leaving and activating groups are known to those of skill in the art. Specific examples useful in the various methods described herein include, but are not limited to, halo, cyano, acyloxy and the myriad other leaving groups known to those of skill in the art to be useful in the formation of amide bonds.

[0119] A specific example of the synthetic method of FIG. 1A is illustrated for the preparation of diphenyl isoxazole 9 in FIG. 1B.

[0120] Another method for synthesizing substituted isoxazoles of structural formula (I) (when Z is —CH—) is provided in FIG. 2A. Claisen condensation of methyl ketone 201 with ester 223 under basic conditions provides 1,3 diketone 229, which may be converted to a mixture of isoxazoles 207 and 231 by treatment with hydroxylamine. Isolation and subsequent reduction of 207 yields the amino isoxazole 209, which may be transformed to the isoxazole 211 as previously described or by other well known synthetic methods. It should be noted that isoxazole 231 may be isolated and converted to the corresponding regioisomer of isoxazole 211 (compound 212) by the same synthetic pathway. A specific example of the synthetic method of FIG. 2A is illustrated for the preparation of diphenyl isoxazole 9 and its corresponding regioisomers 5 in FIG. 2B.

[0121] In alternative embodiment of the pathway illustrated in FIG. 2A, ester 225 is condensed with methyl ketone 227 to provide 1,3 diketone 229, which is then carried through the remainder of the synthetic pathway as previously described.

[0122] Still another method for synthesizing substituted isoxazoles of structural formula (I) (when Z is —CH—) is provided in FIG. 3A. Nucleophilic addition of hydroxylamine to benzaldehyde 245 provides an intermediate oxime, which may be converted by treatment with N-chlorosuccinimide (NCS) or other methods known in the art to the α-chlorooxime 247. Dehydrohalogenation of α-chlorooxime 247 in the presence of a base yields nitrile oxide 248a or 248b, which undergoes 1,3 dipolar cycloaddition in the presence of acetylene 249 to provide the desired isoxazole 211. As will be recognized by skilled artisans, the nitrile oxide 248a or 248b can be isolated prior to cycloaddition with acetylene 249 or, alternatively, acetylene 249 may be added directly to the reaction mixture without first isolating the nitrile oxide 248a or 248b. Acetylene 249 may be readily prepared from commercially available precursors by well known synthetic methods. Specific methods are provided in FIGS. 7A and 7B. A specific example of the synthetic method of FIG. 3A is illustrated for the preparation of diphenyl isoxazole 9 in FIG. 3B.

[0123] Methods for preparing nitrile oxide 248a or 248b are illustrated in FIG. 3C. Referring to FIG. 3C, myriad different types of benzylic compounds 303 are converted to the benzylic nitro compound 305 using standard techniques. Treatment with phenyl isocyanate in the presence of a weak base yields nitrile oxide 248a or 248b. 1,3-Dipolar cycloaddition with acetylene 309 yields isoxazole 311. In acetylene 309 and isoxazole 311, R¹⁵ is —NO₂, —NHR or —NR¹¹C(O)R¹², where R is hydrogen, lower alkyl or a protecting group and R¹¹ and R¹² are as previously defined for structural formula (I). Depending upon the identity of R¹⁵, isoxazole 311 is then converted to isoxazole 211 using the previously described methods.

[0124] Still another method for synthesizing substituted isoxazoles of structural formula (I) (when Z is —CH—) is provided in FIG. 4A. Nucleophilic addition of hydroxylamine to benzaldehyde 245 provides an intermediate oxime, which may be directly converted to nitrile oxide 248a or 248b with NaOCl in the presence of NaOH. 1,3 Dipolar cycloaddition of nitrile oxide 248a or 248b to methyl ketone 259 provides desired isoxazole 211. Methyl ketone 259 may be readily prepared from commercially available precursors by well known synthetic methods. A specific example of the synthetic method of FIG. 4A is illustrated for the preparation of diphenyl isoxazole 9 in FIG. 4B.

[0125] The methods described in FIGS. 1-4 above may be readily adapted for the synthesis of pyrazoles by substituting hydrazine for hydroxylamine in the reaction sequence. Further, those of skill in the art will appreciate that isoxazole regioisomers of those depicted in the above FIGS. 1-4 may be synthesized by merely interchanging the reactive functionalities of the two different aromatic rings. An example of this approach is depicted in FIG. 4C for “reverse” isoxazole 5. As can be seen in FIG. 4C, interchanging the chlorooxime and alkyne functionalities of the two different aromatic rings (i.e., rings A and C) provides the regioisomeric isoxazole 5 (compare 253 and 255 with 254 and 256). Further, certain synthetic schemes may provide both isoxazole regioisomers (e.g., FIGS. 2A and 2B) directly, which may be isolated from one another using standard techniques.

[0126] One method for synthesizing substituted oxadiazoles of structural formula (I) (when Z is —N—) is provided in FIG. 5A. Referring to FIG. 5A, nucleophilic addition of hydroxylamine to phenyl cyanide 265 yields the amide oxime 267, which may be condensed with compound 269 to provide oxadiazole 271 after dehydrative cyclization and reduction. Amino oxadiazole 271 may be optionally alkylated followed by acylation, as described above, to yield oxadiazole 273. A specific example of the synthetic method of FIG. 5A is illustrated for the preparation of diphenyl oxadiazole 25 in FIG. 5B.

[0127] Another method for synthesizing substituted oxadiazoles of structural formula (I) (when Z is —N—), which are regioisomers of those prepared above, is provided in FIG. 6A. Referring to FIG. 6A, amide oxime 287, (prepared by condensation of hydroxylamine with a phenyl cyanide), may be condensed with acylating agent 285, which may be an acyl chloride, to provide oxadiazole 289 after dehydrative cyclization and reduction. Amino oxadiazole 289 may be transformed by the previously described methods to final product 291. A specific example of the synthetic method of FIG. 6A is illustrated for the preparation of diphenyl oxadiazole 87 in FIG. 6B.

[0128]FIGS. 7A and 7B, which describe the preparation of acetylene compounds, are discussed in the Examples section.

[0129] In FIGS. 1-13, substituents R², R³, R⁴, R⁵, R⁶, R⁸, R⁹, R¹⁰ and R¹³ may include reactive functional groups that require protection during synthesis. Selection of suitable protecting groups will depend on the identity of the functional group and the synthesis method employed, and will be apparent to those of skill in the art. Guidance for selecting suitable protecting groups can be found in Greene & Wuts, supra, and the various other references cited therein.

[0130] Further guidance for carrying out 1,3-dipolar cycloaddition reactions, also named 1,3-dipolar additions, [3+2] cyclizations or [3+2] cycloadditions, can be found in “Cycloaddition Reactions in Organic Synthesis”, (Kobayashi, S. and Jorgensen, K. A., Editors), 2002, Wiley-VCH Publishers, pp. 1-332 pages (specifically, Chapters 6 and 7 on [3+2] cycloadditions and 1,3-dipolar additions, pp. 211-248 and 249-300); “1,3-Dipolar Cycloaddition”, Chemistry of Heterocyclic Compounds, Vol. 59, (Padwa, A. and Pearson, W., Editors), 2002, John Wiley, New York, pp. 1-940; “Nitrile Oxides, Nitrones, Nitronates in Organic Synthesis: Novel Strategies in Synthesis”, Torssel, K. B. G., 1988, VCH Publishers, New York, pp. 1-332; Barnes & Spriggs, 1945, J. Am. Chem Soc. 67:134; and Anjaneyulu et al., 1995, Indian J. Chem., Sect. 5 34(11):933-938).

[0131] Further guidance for synthesizing isoxozoles may be found in M. Sutharchanadevi, R. Murugan in Comprehensive Heterocyclic Chemistry II, A. R. Katritzky, C. W. Rees, E. F. V. Scriven, Eds.; Pergamon Press, Oxford, Vol. 3, p. 221; R. Grünager, P, Vita-Finzi in Heterocyclic Compounds, Vol. 49, Isoxazoles, Part one, John Wiley and Sons, New York, 1991; K. B. G. Torssell, Nitrile Oxides, Nitrones, and Nitronates in Organic Synthesis, VCH Publishers, New York, 1988; Y-Y. Ku, T. Grieme, P. Sharma, Y.-M. Pu, P. Raje, H. Morton, S. King Organic Letters, 2001, 3, 4185; V. G. Desai, S. G. Tilve Synth. Comm., 1999, 29, 3017; X. Wei, J. Fang, Y. Hu, H. Hu Synthesis, 1992, 1205; C. Kashima, N. Yoshihara, S. Shirai Heterocycles, 1981, 16, 145; A. S. R. Anjaneyulu, G. S. Rani, K. G. Annapurna, U. V. Mallavadhani, Y. L. N. Murthy Indian J. Chem. Sect B, 1995, 34, 933; R. P. Barnes, A. S. Spriggs, J. Am. Chem. Soc., 1945, 67, 134; A. Alberola, L. Calvo, A. G. Ortega, M. L. Sábada, M. C. Sañudo, S. G. Granda, E. G. Rodriguez Heterocycles, 1999, 51, 2675; X. Wang, J. Tan, K. Grozinger Tetrahedron Lett. 2000, 41, 4713; A. R. Katritzky, M. Wang, S. Zhang, M. V. Voronkov J. Org. Chem., 2001, 66, 6787; and J. Bohrisch, M. Pätzel, C. Mügge, J. Liebscher Synthesis, 1991, 1153. Further guidance for synthesizing pyrazoles may be found in J. Elguero in Comprehensive Heterocyclic Chemistry II, A. R. Katritzky, C. W. Reees, E. F. V. Scriven., Eds.; Pergamon Press, Oxford, 1996; Vol. 3, p.1.

[0132] 5.4 Assays for Modulation of HCV

[0133] The compounds of the invention are potent inhibitors of HCV replication and/or proliferation. The activity of the compounds of the invention can be confirmed in in vitro assays suitable for measuring inhibition of viral or retroviral replication and/or proliferation. The assays may investigate any parameter that is directly or indirectly under the influence of HCV, including, but not limited to, protein-RNA binding, translation, transcription, genome replication, protein processing, viral particle formation, infectivity, viral transduction, etc. Such assays are well-known in the art. Regardless of the parameter being investigated, in one embodiment, to examine the extent of inhibition, samples, cells, tissues, etc. comprising an HCV replicon or HCV RNA are treated with a potential inhibitory compound (test compound) and the value for the parameter compared to control cells (untreated or treated with a vehicle or other placebo). Control samples are assigned a relative activity value of 100%. Inhibition is achieved when the activity value of the test compound relative to the control is about 90%, preferably 50%, and more preferably 25-0%.

[0134] Alternatively, the extent of inhibition may be determined based upon the IC₅₀ of the compound in the particular assay, as will be described in more detail, below.

[0135] In one embodiment, the inhibitory activity of the compounds can be confirmed in a replicon assay that assesses the ability of a test compound to block or inhibit HCV replication in replicon cells. One example of a suitable replicon assay is the liver cell-line Huh 7-based replicon assay described in Lohmann et al., 1999, Science 285:110-113. A specific example of this replicon assay which utilizes luciferase translation is provided in the Examples Section. In one embodiment of this assay, the amount of test compound that yields a 50% reduction in translation as compared to a control cell (IC₅₀) may be determined.

[0136] Alternatively, the inhibitory activity of the compounds can be confirmed using a quantitative Western immunoblot assay utilizing antibodies specific for HCV non-structural proteins, such as NS3, NS4A NS5A and NS5B. In one embodiment of this assay, replicon cells are treated with varying concentrations of test compound to determine the concentration of test compound that yields a 50% reduction in the amount of a non-structural protein produced as compared to a control sample (IC₅₀). A single non-structural protein may be quantified or multiple non-structural proteins may be quantified. Antibodies suitable for carrying out such immunoblot assays are available commercially (e.g., from BIODESIGN International, Saco, Me.).

[0137] Alternatively, the inhibitory activity of the compounds may be confirmed in an HCV infection assay, such as the HCV infection assay described in Fournier et al., 1998, J. Gen. Virol. 79(10):2367:2374, the disclosure of which is incorporated herein by reference. In one embodiment of this assay, the amount of test compound that yields a 50% reduction in HCV replication or proliferation as compared to a control cell (IC₅₀) may be determined. The extent of HCV replication may be determined by quantifying the amount of HCV RNA present in HCV infected cells. A specific method for carrying out such an assay is provided in the Examples section.

[0138] As yet another example, the inhibitory activity of the compounds can be confirmed using an assay that quantifies the amount of HCV RNA transcribed in treated replicon cells using, for example, a Taqman assay (Roche Molecular, Alameda, Calif.). In one embodiment of this assay, the amount of test compound that yields a 50% reduction in transcription of one or more HCV RNAs as compared to a control sample (IC₅₀) may be determined.

[0139] Regardless of the assay used, active compounds are generally those which exhibit IC₅₀s in the particular assay in the range of about 1 mM or less. Compounds which exhibit lower IC₅₀s, for example, in the range of about 100 μM, 10 μM, 1 μM, 100 nM, 10 nM, 1 nM, or even lower, are particularly useful for as therapeutics or prophylactics to treat or prevent HCV infections.

[0140] 5.5 Uses and Administration

[0141] Owing to their ability to inhibit HCV replication, the compounds of the invention and/or compositions thereof can be used in a variety of contexts. For example, the compounds of the invention can be used as controls in in vitro assays to identify additional more or less potent anti HCV compounds. As another example, the compounds of the invention and/or compositions thereof can be used as preservatives or disinfectants in clinical settings to prevent medical instruments and supplies from becoming infected with HCV virus. When used in this context, the compound of the invention and/or composition thereof may be applied to the instrument to be disinfected at a concentration that is a multiple, for example 1×, 2×, 3×, 4×, 5× or even higher, of the measured IC₅₀ for the compound.

[0142] In a specific embodiment, the compounds and/or compositions can be used to “disinfect” organs for transplantation. For example, a liver or portion thereof being prepared for transplantation can be perfused with a solution comprising an inhibitory compound of the invention prior to implanting the organ into the recipient. This method has proven successful with lamuvidine (3TC, Epivir®, Epivir-HB®) for reducing the incidence of hepatitis B virus (HBV) infection following liver transplant surgery/therapy. Quite interestingly, it has been found that such perfusion therapy not only protects a liver recipient free of HBV infection (HBV−) from contracting HBV from a liver received from an HBV+ donor, but it also protects a liver from an HBV− donor transplanted into an HBV+ recipient from attack by HBV. The compounds of the invention may be used in a similar manner prior to organ or liver transplantation.

[0143] The compounds of the invention and/or compositions thereof find particular use in the treatment and/or prevention of HCV infections in animals and humans. When used in this context, the compounds may be administered per se, but are typically formulated and administered in the form of a pharmaceutical composition. The exact composition will depend upon, among other things, the method of administration and will apparent to those of skill in the art. A wide variety of suitable pharmaceutical compositions are described, for example, in Remington's Pharmaceutical Sciences, 20^(th) ed., 2001).

[0144] Formulations suitable for oral administration can consist of (a) liquid solutions, such as an effective amount of the active compound suspended in diluents, such as water, saline or PEG 400; (b) capsules, sachets or tablets, each containing a predetermined amount of the active ingredient, as liquids, solids, granules or gelatin; (c) suspensions in an appropriate liquid; and (d) suitable emulsions. Tablet forms can include one or more of lactose, sucrose, mannitol, sorbitol, calcium phosphates, corn starch, potato starch, microcrystalline cellulose, gelatin, colloidal silicon dioxide, talc, magnesium stearate, stearic acid, and other excipients, colorants, fillers, binders, diluents, buffering agents, moistening agents, preservatives, flavoring agents, dyes, disintegrating agents, and pharmaceutically compatible carriers. Lozenge forms can comprise the active ingredient in a flavor, e.g., sucrose, as well as pastilles comprising the active ingredient in an inert base, such as gelatin and glycerin or sucrose and acacia emulsions, gels, and the like containing, in addition to the active ingredient, carriers known in the art.

[0145] The compound of choice, alone or in combination with other suitable components, can be made into aerosol formulations (i.e., they can be “nebulized”) to be administered via inhalation. Aerosol formulations can be placed into pressurized acceptable propellants, such as dichlorodifluoromethane, propane, nitrogen, and the like.

[0146] Suitable formulations for rectal administration include, for example, suppositories, which consist of the packaged nucleic acid with a suppository base. Suitable suppository bases include natural or synthetic triglycerides or paraffin hydrocarbons. In addition, it is also possible to use gelatin rectal capsules which consist of a combination of the compound of choice with a base, including, for example, liquid triglycerides, polyethylene glycols, and paraffin hydrocarbons.

[0147] Formulations suitable for parenteral administration, such as, for example, by intraarticular (in the joints), intravenous, intramuscular, intradermal, intraperitoneal, and subcutaneous routes, include aqueous and non-aqueous, isotonic sterile injection solutions, which can contain antioxidants, buffers, bacteriostats, and solutes that render the formulation isotonic with the blood of the intended recipient, and aqueous and non-aqueous sterile suspensions that can include suspending agents, solubilizers, thickening agents, stabilizers, and preservatives. In the practice of this invention, compositions can be administered, for example, by intravenous infusion, orally, topically, intraperitoneally, intravesically or intrathecally. Parenteral administration, oral administration, subcutaneous administration and intravenous administration are the preferred methods of administration. A specific example of a suitable solution formulation may comprise from about 0.5-100 mg/ml compound and about 1000 mg/ml propylene glycol in water. Another specific example of a suitable solution formulation may comprise from about 0.5-100 mg/ml compound and from about 800-1000 mg/ml polyethylene glycol 400 (PEG 400) in water.

[0148] A specific example of a suitable suspension formulation may include from about 0.5-30 mg/ml compound and one or more excipents selected from the group consisting of: about 200 mg/ml ethanol, about 1000 mg/ml vegetable oil (e.g., corn oil), about 600-1000 mg/ml fruit juice (e.g., grapefruit juice), about 400-800 mg/ml milk, about 0.1 mg/ml carboxymethylcellulose (or microcrystalline cellulose), about 0.5 mg/ml benzyl alcohol (or a combination of benzyl alcohol and benzalkonium chloride) and about 40-50 mM buffer, pH 7 (e.g., phosphate buffer, acetate buffer or citrate buffer or, alternatively 5% dextrose may be used in place of the buffer) in water.

[0149] A specific example of a suitable liposome suspension formulation may comprise from about 0.5-30 mg/ml compound, about 100-200 mg/ml lecithin (or other phospholipid or mixture of phospholipids) and optionally about 5 mg/ml cholesterol in water. For subcutaneous administration of a suitable compound, a liposome suspension formulation including 5 mg/ml compound in water with 100 mg/ml lecithin and 5 mg/ml compound in water with 100 mg/ml lecithin and 5 mg/ml cholesterol provides good results. This formulation may be used for other compounds of the invention.

[0150] The formulations of compounds can be presented in unit-dose or multi-dose sealed containers, such as ampules and vials. Injection solutions and suspensions can be prepared from sterile powders, granules, and tablets of the kind previously described.

[0151] The pharmaceutical preparation is preferably in unit dosage form. In such form the preparation is subdivided into unit doses containing appropriate quantities of the active component. The unit dosage form can be a packaged preparation, the package containing discrete quantities of preparation, such as packeted tablets, capsules, and powders in vials or ampoules. Also, the unit dosage form can be a capsule, tablet, cachet, or lozenge itself, or it can be the appropriate number of any of these in packaged form. The composition can, if desired, also contain other compatible therapeutic agents, discussed in more detail, below.

[0152] In therapeutic use for the treatment of HCV infection, the compounds utilized in the pharmaceutical method of the invention are administered to patients diagnosed with HCV infection at dosage levels suitable to achieve therapeutic benefit. By therapeutic benefit is meant that the administration of compound leads to a beneficial effect in the patient over time. For example, therapeutic benefit is achieved when the HCV titer or load in the patient is either reduced or stops increasing. Therapeutic benefit is also achieved if the administration of compound slows or halts altogether the onset of the organ damage that or other adverse symptoms typically accompany HCV infections, regardless of the HCV titer or load in the patient.

[0153] The compounds of the invention and/or compositions thereof may also be administered prophylactically in patients who are at risk of developing HCV infection, or who have been exposed to HCV, to prevent the development of HCV infection. For example, the compounds of the invention and/or compositions thereof may be administered to hospital workers accidentally stuck with needles while working with HCV patients to lower the risk of, or avoid altogether, developing an HCV infection.

[0154] Initial dosages suitable for administration to humans may be determined from in vitro assays or animal models. For example, an initial dosage may be formulated to achieve a serum concentration that includes the IC₅₀ of the particular compound being administered, as measured in an in vitro assay. Alternatively, an initial dosage for humans may be based upon dosages found to be effective in animal models of HCV infection. Exemplary suitable model systems are described, for example, in Muchmore, 2001, Immunol. Rev. 183:86-93 and Lanford & Bigger, 2002, Virology, 293:1-9, and the referenced cited therein. As one example, the initial dosage may be in the range of about 0.01 mg/kg/day to about 200 mg/kg/day, or about 0.1 mg/kg/day to about 100 mg/kg/day, or about 1 mg/kg/day to about 50 mg/kg/day, or about 10 mg/kg/day to about 50 mg/kg/day, can also be used. The dosages, however, may be varied depending upon the requirements of the patient, the severity of the condition being treated, and the compound being employed. The size of the dose also will be determined by the existence, nature, and extent of any adverse side-effects that accompany the administration of a particular compound in a particular patient. Determination of the proper dosage for a particular situation is within the skill of the practitioner. Generally, treatment is initiated with smaller dosages which are less than the optimum dose of the compound. Thereafter, the dosage is increased by small increments until the optimum effect under circumstances is reached. For convenience, the total daily dosage may be divided and administered in portions during the day, if desired.

[0155] 5.6 Combination Therapy

[0156] In certain embodiments of the present invention, the compounds of the invention and/or compositions thereof can be used in combination therapy with at least one other therapeutic agent. A compound of the invention and/or composition thereof and the therapeutic agent can act additively or, more preferably, synergistically. The compound of the invention and/or a composition thereof may be administered concurrently with the administration of the other therapeutic agent(s), or it may be administered prior to or subsequent to administration of the other therapeutic agent(s).

[0157] In one embodiment, the compounds of the invention and/or compositions thereof are used in combination therapy with other antiviral agents or other therapies known to be effective in the treatment or prevention of HCV. As a specific example, the compounds of the invention and/or compositions thereof may be used in combination with known antivirals, such as ribavirin (see, e.g., U.S. Pat. No. 4,530,901). As another specific example, the compounds of the invention and/or compositions thereof may also be administered in combination with one or more of the compounds described in any of the following: U.S. Pat. No. 6,143,715; U.S. Pat. No. 6,323,180; U.S. Pat. No. 6,329,379; U.S. Pat. No. 6,329,417; U.S. Pat. No. 6,410,531; U.S. Pat. No. 6,420,380; and U.S. Pat. No. 6,448,281.

[0158] Yet another specific example, the compounds of the invention and/or compositions thereof may be used in combination with interferons such as α-interferon, β-interferon and/or γ-interferon. The interferons may be unmodified, or may be modified with moieties such as polyethylene glycol (pegylated interferons). Many suitable unpegylated and pegylated interferons are available commercially, and include, by way of example and not limitation, recombinant interferon alpha-2b such as Intron-A interferon available from Schering Corporation, Kenilworth, N.J., recombinant interferon alpha-2a such as Roferon interferon available from Hoffmann-La Roche, Nutley, N.JU., recombinant interferon alpha-2C such as Berofor alpha 2 interferon available from Boehringer Ingelheim Pharmaceutical, Inc., Ridgefield, Conn., interferon alpha-n1, a purified blend of natural alpha interferons such as Sumiferon available from Sumitomo, Japan or as Wellferon interferon alpha-n1 (INS) available from the Glaxo-Wellcome Ltd., London, Great Britain, or a consensus alpha interferon such as those described in U.S. Pat. Nos. 4,897,471 and 4,695,623 (especially Examples 7, 8 or 9 thereof) and the specific product available from Amgen, Inc., Newbury Park, Calif., or interferon alpha-n3 a mixture of natural alpha interferons made by Interferon Sciences and available from the Purdue Frederick Co., Norwalk, Conn., under the Alferon Tradename, pegylated interferon-2b available from Schering Corporation, Kenilworth, N.J. under the tradename PEG-Intron A and pegylated interferon-2a available from Hoffman-LaRoche, Nutley, N.J. under the tradename Pegasys.

[0159] As yet another specific example, the compounds of the invention and/or compositions thereof may be administered in combination with both ribovirin and an interferon.

6. EXAMPLES

[0160] The following examples are provided by way of illustration only and not by way of limitation. Those of skill in the art will readily recognize a variety of noncritical parameters that could be changed or modified to yield essentially similar results

[0161] 6.1 Compound Syntheses

[0162] The compounds of TABLE 1 were synthesized according to the methods described below as illustrated in FIGS. 1-13 or as generally described in U.S. Ser. No. 10/286,017, filed Nov. 1, 2002, published Sep. 4, 2003 as US Publication No. 20030165561 A1 and WO 03040112 A1 published on May 14, 2003, the contents of which are incorporated herein. Melting points were obtained on an Electrothermal IA9100 series digital melting point apparatus. All Melting points are uncorrected. NMR spectra were obtained on a 300 MHz Varian Mercury system. LC-MS was performed on a Waters Micromass ZQ instrument with electrospray ionization. The HPLC component was a Waters Model 2690 Separation module coupled to a Waters Model 996 photodiode array detector. The specific LC-MS method used to analyze particular compounds, indicated for each compound in parentheses, are provided below:

[0163] Method W

[0164] This method utilized a 2.1×250 mm 5 μM C-18 Altima reversed phase column (Alltech) with a flow rate of 0.25 mL/min and a gradient of 5-85% acetonitrile with water containing 0.1% trifluoroacetic acid over 36 min. The gradient then ramps to 100% acetonitrile over 0.5 min and continues at 100% acetonitrile for 3.5 min.

[0165] Method X

[0166] This method utilized a 2.1×250 mm 5 μM C-18 Altima reversed phase column (Alltech) with a flow rate of 0.25 mL/min and a gradient of 5-85% acetonitrile with water containing 0.1% trifluoroacetic acid over 15 min. The gradient then ramps to 100% acetonitrile over 0.5 min and continues at 100% acetonitrile for 2.5 min.

[0167] Method Y

[0168] This method utilized a 2.1×150 mm Agilent Zorbax 5 μM C-18 reversed phase column with a flow rate of 0.3 mL/min and a gradient of 10-100% acetonitrile with water containing 0.1% trifluoroacetic acid over 16 min, then continuing for 2 min with 100% acetonitrile.

[0169] Method Z

[0170] This method utilized a 2.1×5 mm Agilent Zorbax 5 μM C-18 reversed phase column with a flow rate of 0.5 mL/min and a gradient of 5-100% acetonitrile with water containing 0.1% trifluoroacetic acid over 8 min, then continuing for 2 min with 100% acetonitrile.

[0171] Synthesis of 2,2-Dichloro-N-[3-[3-(2,6-dichlorophenyl)-5-isoxazolyl]phenyl] Acetamide (Compound 9)

[0172] Synthesis of 2,6-Dichloro-N-hydroxybenzenecarboximidoyl Chloride

[0173] The general procedure of R. K. Howe et al, J. Org. Chem., 1980, 45, 3916-3918 was followed. 2,6-Dichlorobenzaldoxime (25.1 gm, 0.132 mol) was dissolved in DMF (150 mL). Then N-chlorosuccinimide (approximately 1.5 g) was added. After several minutes the reaction was heated until the internal temperature reached 50° C. Then the remainder of the N-chlorosuccinimide was added in small portions to a total of 17.6 g (0.132 mol), keeping the reaction temperature at 40-50° C. After the addition was complete, the reaction was allowed to stir for 0.5 h, then was diluted with 600 mL of water. The mixture was extracted twice with ether. The combined ether extracts were washed three times with water, dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The residue was concentrated under vacuum to give the title α-chlorooxime as a white solid (m.p. 89-90° C.). NMR (300 MHz, CDCl₃): 7.98 (s, 1H, exchanges with D₂O), 7.3-7.4 ppm (m, 3H).

[0174] Synthesis of 2,2-Dichloro-N-(3-ethynylphenyl) Acetamide

[0175] 3-Ethynylaniline (2.61 g, 22.3 mmol) was dissolved in anhydrous dichloromethane (20 mL) with triethylamine (3.1 mL, 22.3 mmol). The mixture was cooled in an ice-bath under nitrogen, then a solution of dichloroacetyl chloride (2.21 mL, 23 mmol) in anhydrous dichloromethane (20 mL) was added dropwise. After the addition was completed the ice-bath was removed and the mixture was stirred at room temperature for 2 h. The reaction mixture was then washed successively with water, 10% hydrochloric acid and saturated sodium bicarbonate solution. The organic solution was dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure to give the title compound as a beige solid (m.p. 99-100° C.). NMR (300 MHz, CDCl₃): 8.05 (broad s, 1H, NH), 7.69 (s, 1H), 7.62 (m, 1H), 7.33 (m, 2H), 6.04 (s, 1H), 3.10 ppm (s, 1H, acetylenic).

[0176] Synthesis of 2,2-Dichloro-N-[3-[3-(2,6-dichlorophenyl)-5-isoxazolyl]phenyl] Acetamide (Compound 9)

[0177] 2,6-Dichloro-N-hydroxybenzenecarboximidoyl chloride (2.72 g, 95.6 mmol) and 2,2-dichloro-N-(3-ethynylphenyl) acetamide (2.5 g, 110 mmol) were dissolved in anhydrous THF (40 mL) and triethylamine (1.8 mL). The mixture was stirred at room temperature for 1 h then heated at reflux for 5 h to generate the 2,6-dichlorophenyl nitrile oxide intermediate, which reacted by a 1,3-dipolar cycloaddition reaction with 2,2-dichloro-N-(3-ethynylphenyl) acetamide. The solvent was removed under reduced pressure. The residue was dissolved in ethyl acetate and washed successively with water and brine. The ethyl acetate solution was dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The resulting solid was purified by column chromatography on silica gel, eluting with 8:2 hexanes-ethyl acetate. The appropriate fractions were combined and then crystallized from hexanes-ethyl acetate to give 2,2-dichloro-N-[3-[3-(2,6-dichlorophenyl)-5-isoxazolyl]phenyl] acetamide as a white crystalline solid, 1.80 g (m.p. 167° C.). NMR (300 MHz, CDCl₃): 8.21 (broad s, 1H, NH), 8.08 (m, 1H), 7.71 (m, 2H), 7.52 (t, 1H), 7.42-7.46 (m, 2H), 7.32-7.38 (m, 1H), 6.69 (s, 1H), 6.07 ppm (s, 1H). MW=416 confirmed by LC-MS, t_(r)=36.9 min (Method W) MH⁺=415-419.

[0178] Oxime Formation (Step 1 of FIG. 3A)

[0179] Method A

[0180] Referring to FIG. 3A, the aldehyde starting material 245 was dissolved in pyridine solvent, and 1.0-1.2 equivalents of solid hydroxylamine hydrochloride was added in one portion and the homogeneous mixture was stirred overnight at room temperature. The mixture was concentrated under reduced pressure. The residue was dissolved in ethyl acetate and this solution was washed with either 1N hydrochloric acid followed by saturated brine, or by saturated brine alone. The ethyl acetate solution was then dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure to yield the desired oxime, 247.

[0181] Method B

[0182] By the general procedure of R. K. Howe, et al J. Heterocyclic Chem., 1982, 19, 721-726 the aldehyde starting material 245 and a molar equivalent amount of hydroxylamine hydrochloride were dissolved in 30% aqueous methanol and stirred at 10-20° C. for 1 h. The solution was cooled to 20° C. for 1 h whereupon the solid oxime (not illustrated) precipitated. The solid oxime was then isolated by filtration followed by air-drying.

[0183] Method C

[0184] By the general procedure of R. K. Howe, et al, J. Org. Chem., 1980, 45, 3916-3918 the aldehyde starting material 245 in 1:1 ethanol-water was treated with 1.1 equivalents of hydroxylamine hydrochloride and 2.5 equivalents of aqueous sodium hydroxide with cooling. The mixture was then stirred at room temperature for 1 h. The reaction mixture was extracted with ether, which was discarded and the aqueous layer was separated and acidified to pH 6 with concentrated hydrochloric acid with cooling. The aqueous layer was extracted with ether and the ether layers were separated. The combined ether layers were dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure to yield the desired solid oximes.

[0185] α-Chlorooxime Formation (Step 2 of FIG. 3A; Compound 247)

[0186] Method D

[0187] Again referring to FIG. 3A, the general procedure described by R. K. Howe, et al, J. Org. Chem., 1980, 45, 3916-3918 was followed. The oxime was dissolved in DMF and 0.1 molar equivalent of N-chlorosuccinimide was added and the mixture was heated to 50° C. to initiate the reaction. The remaining 0.9 molar equivalent of N-chlorosuccinimide was added in small portions keeping the reaction temperature under 50° C. After the addition was completed, the mixture was stirred for 0.5 h and then diluted with water. The mixture was extracted with ether and the combined ether extracts were washed with water and brine. The ether layer was dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure to yield the desired α-chlorooxime 247.

[0188] Method E

[0189] The general procedure described by R. K. Howe, et al, J. Org. Chem., 1980, 45, 3916-3918 was followed. The oxime was dissolved in DMF and 0.1 molar equivalent of N-chlorosuccinimide was added and the mixture was heated to 50° C. to initiate the reaction. The remaining 0.9 molar equivalent of N-chlorosuccinimide was added in small portions keeping the reaction temperature under 50° C. After the addition was complete the mixture was stirred for 3 h at room temperature. The resulting DMF solution containing the desired α-chlorooxime 247 was used immediately in the next step.

[0190] General Procedures for the Preparation of 2-Halo- or 2,2-Dihalo-N-(3-ethynylphenyl) Acetamides (FIGS. 7A & 7B)

[0191] Method F (FIG. 7A)

[0192] Step 1. Acetylenic Cross-Coupling Reactions

[0193] Referring to FIG. 7A, the appropriately substituted m-bromonitrobenzene 315 or substituted m-iodonitrobenzene was dissolved in a suitable solvent such as p-dioxane or THF and then treated with at least five molar equivalents of a suitable amine base, which could be triethylamine, diethylamine or diisopropylethylamine. Alternatively, the amine base alone could be used as the solvent. A stream of argon gas was then bubbled through the solution for several minutes, followed by the addition of dichlorobis(triphenylphosphine) palladium (II) (3-4 mole percent), CuI (6-8 mole percent) and finally trimethylsilylacetylene (1.2-1.3 molar equivalents). The reaction mixture was then heated at 50-80° C. until the reaction was complete, as monitored by TLC or LC-MS. When the more reactive substituted m-iodonitrobenzenes were used, the acetylenic cross-coupling reaction could be performed at room temperature. If the reaction appeared sluggish, additional trimethylsilylacetylene was added. This general procedure is known in the literature as the Sonogashira coupling (K. Sonogashira et. al., Tetrahedron Lett., 1975, 4467). The reaction mixture was then diluted with ethyl acetate and this solution was washed several times with brine. Alternatively, the crude reaction mixture was filtered over a pad of Celite, then diluted with ethyl acetate and washed with brine. The organic layer so obtained was dried over anhydrous sodium sulfate, filtered and concentrated to dryness under reduced pressure. The residue was purified by column chromatography on silica gel, eluting with mixtures of ethyl acetate and hexanes to give the desired substituted m-(trimethylsilylethynyl) nitrobenzenes 317.

[0194] Step 2. Reduction of the Nitro Group to Amines

[0195] The substituted m-(trimethylsilylethynyl) nitrobenzene 317 prepared in Step 1 was dissolved in a mixture of 10-15 volume percent of concentrated hydrochloric acid in methanol. Then, iron powder (Aldrich Chemical Co.) (5-10 molar equivalents) was added and the mixture was heated at 70-80° C. for 3-4 h. This reaction can be highly exothermic when performed on a large scale. After cooling to room temperature, the reaction mixture was filtered over Celite and the filtrate was concentrated under reduced pressure. The residue was dissolved in ethyl acetate and then carefully washed with either aqueous sodium hydroxide or aqueous sodium bicarbonate solution. The aqueous layer was discarded and the organic layer was washed with brine, dried over anhydrous sodium sulfate, filtered and concentrated to dryness under reduced pressure. If necessary the crude product could be purified by column chromatography on silica gel, eluting with mixtures of hexanes and ethyl acetate to give the desired substituted m-(trimethylsilylethynyl) anilines 319.

[0196] Step 3. Removal of the Trimethylsilyl Group from the Acetylenes

[0197] The substituted m-(trimethylsilylethynyl) aniline 319 prepared in Step 2 was dissolved in methanol containing 2-5% water. If the solubility of the aniline in methanol was poor, an appropriate amount of tetrahydrofuran (THF) was used as a co-solvent. Then anhydrous potassium carbonate (1 molar equivalent) was added and the mixture was stirred at room temperature for 1-24 h until the reaction was complete by TLC analysis. The reaction mixture was concentrated under reduced pressure and the residue was dissolved in ethyl acetate and washed with brine. The organic layer was dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The substituted m-aminophenylacetylenes 321 could be purified by column chromatography on silica gel, eluting with hexanes and ethyl acetate, if necessary.

[0198] Step 4. Introduction of the Haloacetamide or Dihaloacetamide Side Chains

[0199] The substituted m-aminophenylacetylene 321 prepared in Step 3 was dissolved in dichloromethane. Triethylamine (1.3 molar equivalents) was added and the solution was cooled in an ice-bath under nitrogen. Then a solution of acetylating reagent LG-C(O)—R¹² (e.g, haloacetyl chloride or dihaloacetyl chloride; 1.0 molar equivalent) in dichloromethane was added dropwise. After the addition was complete, the reaction was allowed to stir 0.5-1 h at 0° C. and then allowed to warm to room temperature. After a total of 1-4 h reaction time the reaction mixture was diluted with water. The organic layer was separated and further washed with saturated aqueous sodium bicarbonate solution and brine. The organic layer was dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure to give the substituted acetamide compound 323.

[0200] Alternatively, the substituted m-aminophenylacetylene 321 starting material was dissolved in dichloromethane and treated successively with 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (1 molar equivalent), a compound of the formula R¹²—C(O)OH (e.g., a halo- or dihaloacetic acid; 1 molar equivalent) and finally triethylamine (1 molar equivalent). The reaction mixture was then stirred at room temperature until the substituted m-aminophenylacetylene starting material 321 was consumed as determined by TLC analysis. The mixture was washed with water and the organic layer was dried over anhydrous sodium sulfate, filtered and concentrated to dryness under reduced pressure to give the acetamide 323.

[0201] Method G (FIG. 7B)

[0202] Referring to FIG. 7B, an appropriately substituted m-iodoaniline or m-bromoaniline starting material 325 was coupled with trimethylsilylacetylene as described in Step 1 of Method F. The resulting substituted m-(trimethylsilylethynyl) aniline 327 was then deprotected using the procedure described in Step 3 of Method F to give the substituted m-aminophenylacetylene 329 which was then converted to the desired acetamide 331 as described in Step 4 of Method F.

[0203] 1,3-Dipolar Cycloaddition Reactions to Make Isoxazoles (FIG. 3A; 247→211)

[0204] Method H

[0205] Referring again to FIG. 3A, the α-chlorooxime 247 and 1.0 molar equivalent of the appropriate phenylacetylene were dissolved in either anhydrous THF or DMF and 1.3 molar equivalents of triethylamine was added. The α-chlorooxime immediately reacted with triethylamine to produce the corresponding phenyl nitrile oxide intermediate (248a or 248b) and also produced a precipitate of triethylamine hydrochloride. The heterogeneous mixture was then heated at 70-80° C. for 3-6 h to induce the 1,3-dipolar cycloaddition reaction of the phenyl nitrile oxide with the phenylacetylene 249. The solvent was removed by concentration under reduced pressure. The residue was dissolved in ethyl acetate and this solution was washed with aqueous sodium bicarbonate solution followed by water and brine. The ethyl acetate layers were dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure to yield the crude product 211. This material was further purified by column chromatography on silica gel, eluting with hexanes-ethyl acetate, or by HPLC chromatography on a C-18 reversed phase column (mobile phase acetonitrile-water-trifluoroacetic acid). The isolated isoxazoles 211 were either crystallized or characterized as solids by spectral analysis.

[0206] In the same manner, the compounds listed below were made from the corresponding α-chlorooximes and the corresponding phenylacetylenes (the structures of the compounds are provided in TABLE 1).

[0207] Compound 1: 2,2-Dichloro-N-[3-[3-(2,6-dichlorophenyl)-5-isoxazolyl]-6-fluorophenyl] Acetamide; MW=434 confirmed by LC-MS, t_(r)=37.75 min (Method W) MH⁺=433-437

[0208] Compound 3: 2,2-Dichloro-N-[3-[3-(2,3-dichlorophenyl)-5-isoxazolyl]phenyl] Acetamide; MW=412 confirmed by LC-MS, t_(r)=38.96 min (Method W) MH⁺=411-415

[0209] Compound 5: 2,2-Dichloro-N-[3-[5-(2,6-dichlorophenyl)-3-isoxazolyl]phenyl] Acetamide; MW=416 confirmed by LC-MS, t_(r)=37.92 min (Method W) MH⁺=415-419

[0210] Compound 7: 2,2-Dichloro-N-[3-[3-[2-chloro-6-(N-morpholino)phenyl]-5-isoxazolyl]phenyl] Acetamide; MW=462 confirmed by LC-MS, t_(r)=35.50 min (Method W) MH⁺=461-465

[0211] Compound 9: 2,2-Dichloro-N-[3-[3-(2,6-dichlorophenyl)-5-isoxazolyl]phenyl] Acetamide; MW=416 confirmed by LC-MS, t_(r)=36.90 min (Method W) MH⁺=415-419

[0212] Compound 11: 2,2-Dichloro-N-[3-[3-(2-fluoro-6-thiomethylphenyl)-5-isoxazolyl]phenyl] Acetamide; MW=411 confirmed by LC-MS, t_(r)=35.96 min (Method W) MH⁺=410-414

[0213] Compound 13: 2,2-Dichloro-N-[3-[3-(2,6-dichlorophenyl)-5-isoxazolyl]4-fluorophenyl] Acetamide; MW=434 confirmed by LC-MS, t_(r)=38.82 min (Method W) MH⁺=433-437

[0214] Compound 15: 2,2-Dichloro-N-[3-[3-(2-chloro-6-fluoro-3-methylphenyl)-5-isoxazolyl]phenyl] Acetamide; MW=414 confirmed by LC-MS, t_(r)=28.91 min (Method X) MH⁺=413-417

[0215] Compound 21: 2,2-Dichloro-N-[3-[3-[2-fluoro-(6-N-morpholinosulfamoyl)phenyl]-5-isoxazolyl]-phenyl] Acetamide; MW=514 confirmed by LC-MS, t_(r)=32.30 min (Method W) MH⁺=513-517

[0216] Compound 23: 2,2-Dichloro-N-[3-[3-[2,6-dimethyl-4-(N-morpholino-2-ethyleneoxy)phenyl]-5-isoxazolyl]phenyl] Acetamide; MW=543 confirmed by LC-MS, t_(r)=27.59 min (Method X) MH⁺=542-546

[0217] Compound 25: 2,2-Dichloro-N-[3-[3-(2,6-dichlorophenyl)-5-(1,2,4-oxadiazolyl)]phenyl] Acetamide; MW=417 confirmed by LC-MS, t_(r)=20.70 min (Method X) MH⁺=416-420

[0218] Compound 27: 2,2-Dichloro-N-[3-[3-(2-chloro-6-fluorophenyl)-5-isoxazolyl]phenyl] Acetamide; MW=400 confirmed by LC-MS, t_(r)=35.94 min (Method W) MH⁺=399-403

[0219] Compound 29: 2,2-Dibromo-N-[3-[3-(2,6-dichlorophenyl)-5-isoxazolyl]phenyl] Acetamide; MW=505 confirmed by LC-MS, t_(r)=33.30 min (Method W) MH⁺=503-507

[0220] Compound 31: 2,2-Dichloro-N-[3-[3-(2-chloro-6-methylphenyl)-5-isoxazolyl]phenyl] Acetamide; MW=396 confirmed by LC-MS, t_(r)=33.26 min (Method W) MH⁺=393-397

[0221] Compound 33: 2,2-Dichloro-N-[3-[3-(2-trifluoromethylphenyl)-5-isoxazolyl]phenyl] Acetamide; MW=415 confirmed by LC-MS, t_(r)=32.10 min (Method W) MH⁺=414-418

[0222] Compound 35: 2,2-Dichloro-N-[3-[3-(2-hydroxy-6-trifluoromethylphenyl)-5-isoxazolyl]phenyl] Acetamide; MW=431 confirmed by LC-MS, t_(r)=13.80 min (Method Y) MH⁺=430-434

[0223] Compound 37: 2,2-Dichloro-N-[3-[3-[2-(N-morpholino)-6-trifluoromethylphenyl)-5-isoxazolyl]phenyl] Acetamide; MW=500 confirmed by LC-MS, t_(r)=36.23 min (Method W) MH⁺=499-503

[0224] Compound 39: 2,2-Dichloro-N-[3-[3-(2-chloro-6-isopropylphenyl)-5-isoxazolyl]phenyl] Acetamide; MW=424 confirmed by LC-MS, t_(r)=21.72 min (Method X) MH⁺=423-427

[0225] Compound 41: 2,2-Dichloro-N-[3-[3-(2-fluoro-6-trifluoromethylphenyl)-5-isoxazolyl]phenyl] Acetamide; MW=433 confirmed by LC-MS, t_(r)=21.05 min (Method Y) MH⁺=432-436

[0226] Compound 43: 2,2-Dichloro-N-[3-[3-(2-fluoro-6-methoxyphenyl)-5-isoxazolyl]phenyl] Acetamide; MW=395 confirmed by LC-MS, t_(r)=34.73 min (Method W) MH⁺=494-498

[0227] Compound 45: 2,2-Dichloro-N-[3-[3-(2-difluoromethoxyphenyl)-5-isoxazolyl]phenyl] Acetamide; MW=413 confirmed by LC-MS, t_(r)=7.48 min (Method Z) MH⁺=412-416

[0228] Compound 47: 2,2-Dichloro-N-[3-[3-(2,6-dimethylphenyl)-5-isoxazolyl]phenyl] Acetamide; MW=375 confirmed by LC-MS, t_(r)=20.69 min (Method X) MH⁺=373-378

[0229] Compound 49: 2,2-Dichloro-N-[3-[3-(2-fluoro-6-iodophenyl)-5-isoxazolyl]phenyl] Acetamide; MW=491 confirmed by LC-MS, t_(r)=37.19 min (Method W) MH⁺=490-494

[0230] Compound 51: 2,2-Dichloro-N-[3-[3-(6-chloro-2-fluoro-3-methylphenyl)-5-isoxazolyl]phenyl] Acetamide; MW=414 confirmed by LC-MS, t_(r)=38.16 min (Method W) MH⁺=413-417

[0231] Compound 53: 2,2-Dichloro-N-[3-[3-(2-chloro-3,6-difluorophenyl)-5-isoxazolyl]phenyl] Acetamide; MW=418 confirmed by LC-MS, t_(r)=21.25 min (Method Y) MH⁺=417-421

[0232] Compound 57: 2,2-Dichloro-N-[3-[3-(2,6-dichlorophenyl)-5-isoxazolyl]phenyl]-N-methyl Acetamide; MW=430 confirmed by LC-MS, t_(r)=20.70 min (Method X) MH⁺=429-433

[0233] Compound 61: 2,2-Dichloro-N-[3-[3-(2-ethoxyphenyl)-5-isoxazolyl]phenyl] Acetamide; MW=391 confirmed by LC-MS, t_(r)=7.66 min (Method Z) MH⁺=390-394

[0234] Compound 63: 2,2-Dichloro-N-[3-[3-(2-isopropylphenyl)-5-isoxazolyl]phenyl] Acetamide; MW=389 confirmed by LC-MS, t_(r)=35.37 min (Method W) MH⁺=388-392

[0235] Compound 65: 2,2-Dichloro-N-[3-[3-(2,6-dichloro-4-dimethylaminophenyl)-5-isoxazolyl]phenyl] Acetamide; MW=496 confirmed by LC-MS, t_(r)=40.10 min (Method W) MH⁺=495-499

[0236] Compound 67: 2-Chloro-N-[3-[3-(2,6-dichlorophenyl)-5-isoxazolyl]phenyl] Acetamide; MW=382 confirmed by LC-MS, t_(r)=34.27 min (Method W) MH⁺=379-383

[0237] Compound 69: 2,2-Dichloro-N-[3-[3-(2,4,6-trimethylphenyl)-5-isoxazolyl]phenyl] Acetamide; MW=389 confirmed by LC-MS, t_(r)=38.76 min (Method W) MH⁺=388-392

[0238] Compound 73: 2,2-Dichloro-N-[3-[3-[2,6-dichloro-4-(N-morpholinopropyleneoxy)phenyl]-5-isoxazolyl]-phenyl] Acetamide; MW=559 confirmed by LC-MS, t_(r)=27.30 min (Method W) MH⁺=558-562

[0239] Compound 75: 2,2-Dichloro-N-[3-[3-[2,6-dichloro 4-(N-morpholinoethyleneoxy)phenyl]-5-isoxazolyl]-phenyl] Acetamide; MW=545 confirmed by LC-MS, t_(r)=26.10 min (Method W) MH⁺=544-548

[0240] Compound 77: 2,2-Dichloro-N-[3-[3-(2-methoxy-6-trifluoromethylphenyl)-5-isoxazolyl]phenyl] Acetamide; MW=445 confirmed by LC-MS, t_(r)=35.02 min (Method W) MH⁺=444-448

[0241] Compound 79: 2,2-Dichloro-N-[3-[3-(2-chloro-6-cyclopropylphenyl)-5-isoxazolyl]phenyl] Acetamide; MW=422 confirmed by LC-MS, t_(r)=38.28 min (Method W) MH⁺=421-425

[0242] Compound 81: 2,2-Dichloro-N-[3-[3-(2-chloro-6-methoxyphenyl)-5-isoxazolyl]phenyl] Acetamide; MW=412 confirmed by LC-MS, t_(r)=34.75 min (Method W) MH⁺=411-415

[0243] Compound 83: 2,2-Dichloro-N-[3-[3-(2-chloro-6-hydroxyphenyl)-5-isoxazolyl]phenyl] Acetamide; MW=398 confirmed by LC-MS, t_(r)=18.04 min (Method X) MH⁺=397-401

[0244] Compound 85: 2,2-Dichloro-N-[3-[3-(2-methyl-6-trifluoromethylphenyl)-5-isoxazolyl]phenyl] Acetamide; MW=429 confirmed by LC-MS, t_(r)=18.83 min (Method X) MH⁺=428-432

[0245] Compound 87: 2,2-Dichloro-N-[3-[5-(2,6-dichlorophenyl)-3-(1,2,4-oxadiazolyl)]phenyl] Acetamide; MW=417 confirmed by LC-MS, t_(r)=18.30 min (Method X) MH⁺+Na=439-443

[0246] Compound 89: 2,2-Dichloro-N-[3-[3-(2-cyclopropyl-6-trifluoromethylphenyl)-5-isoxazolyl]phenyl] Acetamide; MW=455 confirmed by LC-MS, t_(r)=19.45 min (Method X) MH⁺=454-458

[0247] Compound 91: 2,2-Dichloro-N-[3-[3-(2-methoxy-6-methylphenyl)-5-isoxazolyl]phenyl] Acetamide; MW=391 confirmed by LC-MS, t_(r)=34.99 min (Method W) MH⁺=390-394

[0248] Compound 93: 2,2-Dichloro-N-[3-[3-(2-isopropyl-6-trifluoromethylphenyl)-5-isoxazolyl]phenyl] Acetamide; MW=457 confirmed by LC-MS, t_(r)=18.11 min (Method X) MH⁺=456-460

[0249] Compound 95: 2,2-Dichloro-N-[3-[3-[2-chloro-6-(N-morpholino-2-ethyleneoxy)phenyl]-5-isoxazolyl]-phenyl] Acetamide; MW=511 confirmed by LC-MS, t_(r)=10.49 min (Method Y) MH⁺=510-514

[0250] Compound 97: 2,2-Dichloro-N-[3-[3-(2-chloro-6-cyclopentylphenyl)-5-isoxazolyl]phenyl] Acetamide; MW=450 confirmed by LC-MS, t_(r)=22.35 min (Method X) MH⁺=449-453

[0251] Compound 99: 2,2-Dichloro-N-[3-[3-[2-chloro-6-(4-methylpiperazino)phenyl]-5-isoxazolyl]phenyl] Acetamide; MW=480 confirmed by LC-MS, t_(r)=25.83 min (Method W) MH⁺=479-483

[0252] Compound 101: 2-Iodo-N-[3-[3-(2,6-dichlorophenyl)-5-isoxazolyl]phenyl] Acetamide; MW=473 confirmed by LC-MS, t_(r)=35.62 min (Method W) MH⁺=472-476

[0253] Compound 103: 2,2-Dichloro-N-[3-[3-(2-chloro-6-n-butylphenyl)-5-isoxazolyl]phenyl] Acetamide; MW=438 confirmed by LC-MS, t_(r)=22.15 min (Method X) MH⁺=437-441

[0254] Compound 105: 2,2-Dichloro-N-[3-[3-(2-cyclopentyl-6-trifluoromethylphenyl)-5-isoxazolyl]phenyl] Acetamide; MW=383 confirmed by LC-MS, t_(r)=37.74 min (Method W) MH⁺=382-386

[0255] Compound 107: 2,2-Dichloro-N-[3-[3-(2,6-dichlorophenyl)-5-isoxazolyl]4-(N-morpholinosulfamoyl)-phenyl] Acetamide; MW=565 confirmed by LC-MS, t_(r)=32.23 min (Method W) MH⁺=564-568

[0256] Compound 109: 2,2-Dichloro-N-[3-[3-[2-trifluoromethyl-6-(4-methylpiperazino)phenyl]-5-isoxazolyl]-phenyl] Acetamide; MW=513 confirmed by LC-MS, t_(r)=26.18 min (Method W) MH⁺=512-516

[0257] Compound 111: 2,2-Dichloro-N-[3-[3-(2-chloro-6-cyclohexylphenyl)-5-isoxazolyl]phenyl] Acetamide; MW=464 confirmed by LC-MS, t_(r)=22.70 min (Method W) MH⁺=463-467

[0258] Compound 113: 2,2-Dichloro-N-[3-[3-(2-trifluoromethoxyphenyl)-5-isoxazolyl]phenyl] Acetamide; MW=431 confirmed by LC-MS, t_(r)=34.26 min (Method W) MH⁺=430-434

[0259] Compound 115: 2,2-Dichloro-N-[3-[3-(2-carbomethoxy)phenyl-5-isoxazolyl]phenyl] Acetamide; MW=405 confirmed by LC-MS, t_(r)=7.08 min (method z) MH⁺=404-408

[0260] Compound 117: 2,2-Dichloro-N-[3-[3-[2-chloro-6-(N-imidazolyl)phenyl]-5-isoxazolyl]phenyl] Acetamide; MW=448 confirmed by LC-MS, t_(r)=24.72 min (Method W) MH⁺=447-451

[0261] Compound 119: 2,2-Dichloro-N-[3-[3-(2-isopropyloxyphenyl)-5-isoxazolyl]phenyl] Acetamide; MW=405 confirmed by LC-MS, t_(r)=34.78 min (Method W) MH⁺=404-408

[0262] Compound 121: 2,2-Dichloro-N-[3-[3-(2,6-diisopropylphenyl)-5-isoxazolyl]phenyl] Acetamide; MW=431 confirmed by LC-MS, t_(r)=22.32 min (Method X) MH⁺=430-434

[0263] Compound 123: 2,2-Dichloro-N-[3-[3-(2-phenyl)phenyl-5-isoxazolyl]phenyl] Acetamide; MW=424 confirmed by LC-MS, t_(r)=21.48 min (Method X) MH⁺=423-427

[0264] Compound 125: 2,2-Dichloro-N-[3-[3-[2,6-dichloro-4-(N-piperidinylethylenoxy)phenyl]-5-isoxazolyl]-phenyl] Acetamide; MW=543 confirmed by LC-MS, t_(r)=27.59 min (Method W) MH⁺=542-546

[0265] Compound 127: 2,2-Dichloro-N-[3-[3-(2,6-dichlorophenyl)-5-isoxazolyl]4-methoxyphenyl] Acetamide; MW=446 confirmed by LC-MS, t_(r)=36.71 min (Method W) MH⁺=445-449

[0266] Compound 129: 2,2-Dichloro-N-[3-[3-(2-cyclopentylphenyl)-5-isoxazolyl]phenyl] Acetamide; MW=415 confirmed by LC-MS, t_(r)=22.24 min (Method X) MH⁺=414-418

[0267] Compound 131: 2-Dichloro-N-[3-[3-[2-chloro-6-(N,N-dimethylethylene-N′-methylamino)phenyl]-5-isoxazolyl]-phenyl] Acetamide; MW=482 confirmed by LC-MS, t_(r)=26.06 min (Method W) MH⁺=481-485

[0268] Compound 132: (±)-2,2-Dichloro-N-[3-[3-[2-chloro-6-(3-dimethylamino-N-pyrrolidino)phenyl]-5-isoxazolyl]-phenyl] Acetamide; MW=494 confirmed by LC-MS, t_(r)=30.00 min (Method W) MH⁺=493-497

[0269] Compound 135: 2,2-Dichloro-N-[3-[3-(3-carbomethoxy-2,6-dichlorophenyl)-5-isoxazolyl]phenyl] Acetamide; MW=474 confirmed by LC-MS, t_(r)=35.61 min (Method W) MH⁺=473-477

[0270] Compound 137: 2,2-Dichloro-N-[3-[3-(2,3,6-trichlorophenyl)-5-isoxazolyl]phenyl] Acetamide; MW=451 confirmed by LC-MS, t_(r)=28.75 min (Method X) MH⁺=450-454

[0271] Compound 139: 2,2-Dichloro-N-[3-[3-(3-carboxy-2,6-dichlorophenyl)-5-isoxazolyl]phenyl] Acetamide; MW=460 confirmed by LC-MS, t_(r)=31.46 min (Method W) MH⁺=459-463

[0272] Compound 141: 2,2-Dichloro-N-[3-[3-(2-chloro-5-trifluoromethylphenyl)-5-isoxazolyl]phenyl] Acetamide; MW=450 confirmed by LC-MS, t_(r)=22.11 min (Method X) MH⁺=449-453

[0273] Compound 143: 2,2-Dichloro-N-[3-[3-[2,4-dichloro-6-(N-morpholino-2-ethyleneoxy)phenyl]-5-isoxazolyl]-phenyl] Acetamide; MW=545 confirmed by LC-MS, t_(r)=28.25 min (Method X) MH⁺=544-548

[0274] Compound 145: 2,2-Difluoro-N-[3-[3-(2,6-dichlorophenyl)-5-isoxazolyl]phenyl] Acetamide; MW=383 confirmed by LC-MS, t_(r)=35.58 min (Method W) MH⁺=382-386

[0275] Compound 149: 2,2-Dichloro-N-[3-[3-(2,6-difluoro-3-methylphenyl)-5-isoxazolyl]phenyl] Acetamide; MW=397 confirmed by LC-MS, t_(r)=37.13 min (Method W) MH⁺=396-400

[0276] Compound 151: 2,2-Dichloro-N-[3-[3-[2-chloro-6-(4-carboethoxypiperidino)phenyl]-5-isoxazolyl]-phenyl] Acetamide; MW=537 confirmed by LC-MS, t_(r)=39.98 min (Method W) MH⁺=536-540

[0277] Compound 153: 2,2-Dichloro-N-[3-[3-(2-fluoro-6-methylsulfonyl)phenyl-5-isoxazolyl]phenyl] Acetamide; MW=443 confirmed by LC-MS, t_(r)=6.62 min (method z) MH⁺=441-445

[0278] Compound 155: 2,2-Dichloro-N-[3-[3-[2-(N-morpholinomethyl)phenyl]-5-isoxazolyl]phenyl] Acetamide; MW=446 confirmed by LC-MS, t_(r)=23.63 min (Method W) MH⁺=445-449

[0279] Compound 157: 2,2-Dichloro-N-[3-[3-(2-carboxyphenyl)-5-isoxazolyl]phenyl] Acetamide; MW=391 confirmed by LC-MS, t_(r)=6.40 min (Method Z) MH⁺=390-394

[0280] Compound 159: 2,2-Dichloro-N-[3-[3-(2,4-dichlorophenyl)-5-isoxazolyl]phenyl] Acetamide

[0281] Compound 161: 2,2-Dichloro-N-[3-[3-(2-benzyloxyphenyl)-5-isoxazolyl]phenyl] Acetamide; MW=453 confirmed by LC-MS, t_(r)=39.69 min (Method W) MH⁺=452-456

[0282] Compound 163: 2,2-Dichloro-N-[3-[3-(2,3-dimethylphenyl)-5-isoxazolyl]phenyl] Acetamide; MW=375 confirmed by LC-MS, t_(r)=37.62 min (Method W) MH⁺=374-378

[0283] Compound 165: 2,2-Dichloro-N-[3-[3-(2,6-dichlorophenyl)-5-isoxazolyl]-6-methylphenyl] Acetamide; MW=430 confirmed by LC-MS, t_(r)=36.48 min (Method W) MH⁺=429-433

[0284] Compound 167: 2,2-Dichloro-N-[3-[3-(2,6-dichlorophenyl)-5-isoxazolyl]-2-methylphenyl] Acetamide; MW=430 confirmed by LC-MS, t_(r)=35.85 min (Method W) MH⁺=429-433

[0285] Compound 169: 2,2-Dichloro-N-[3-[3-(2,6-dichlorophenyl)-5-isoxazolyl][6-(N-morpholino)phenyl] Acetamide; MW=501 confirmed by LC-MS, t_(r)=39.10 min (Method W) MH⁺=500-504.

[0286] Compound 171: 2,2-Dichloro-N-[3-[3-(2,6-dichlorophenyl)-5-isoxazolyl]-6-(N-morpholino-2-ethyleneoxy)phenyl] Acetamide; MW=545 confirmed by LC-MS, t_(r)=27.77 min (Method W) MH⁺=544-548

[0287] Compound 173: 2,2-Dichloro-N-[3-[3-(2,6-dichlorophenyl)-5-isoxazolyl]-6-methoxyphenyl] Acetamide; MW=446 confirmed by LC-MS, t_(r)=20.80 min (Method X) MH⁺=445-449

[0288] Compound 175: 2,2-Dichloro-N-[3-[3-[2-chloro-6-[4-(N-piperidinyl)-N-piperidinyl]phenyl]-5-isoxazolyl]phenyl] Acetamide; MW=548 confirmed by LC-MS, t_(r)=27.95 min (Method W) MH⁺=547-551

[0289] Compound 177: 2,2-Dichloro-N-[3-[3-(2-chlorophenyl)-5-isoxazolyl]phenyl] Acetamide; MW=382 confirmed by LC-MS, t_(r)=15.45 min (Method Y) MH⁺=381-385

[0290] Compound 179: 2,2-Dichloro-N-[3-[3-(2-bromophenyl)-5-isoxazolyl]phenyl] Acetamide; MW=426 confirmed by LC-MS, t_(r)=15.59 min (Method Y) MH⁺=425-429

[0291] Compound 181: 2,2-Dichloro-N-[3-[3-(2-chloro-6-nitrophenyl)-5-isoxazolyl]phenyl] Acetamide; MW=426 confirmed by LC-MS, t_(r)=14.47 min (Method Y) MH⁺=425-429

[0292] Compound 183: 2,2-Dichloro-N-[3-[3-(2-methoxyphenyl)-5-isoxazolyl]phenyl] Acetamide; MW=377 confirmed by LC-MS, t_(r)=14.90 min (Method Y) MH⁺=376-380

[0293] Compound 185: 2,2-Dichloro-N-[3-[3-(2-bromo-6-chlorophenyl)-5-isoxazolyl]phenyl] Acetamide; MW=461 confirmed by LC-MS, t_(r)=15.58 min (Method Y) MH⁺=460-464

[0294] Compound 187: 2,2-Dichloro-N-[3-[3-(2-chloro-6-(4-amino-N-piperidinyl)phenyl]-5-isoxazolyl]phenyl] Acetamide; MW=480 confirmed by LC-MS, t_(r)=10.90 min (Method Y) MH⁺=479-483

[0295] Preparation of 1,2,4-Oxadiazoles

[0296] 2,2-Dichloro-N-[3-[3-(2,6-dichlorophenyl)-5-(1,2,4 oxadiazolyl)]phenyl] Acetamide (Compound 25)

[0297] Step 1

[0298] 2,6-Dichlorobenzamidoxime (1.0 g) was dissolved in pyridine and m-nitrobenzoyl chloride (0.91 gm, 1.0 molar equivalent) was added. The solution was stirred at room temperature for 1 h under nitrogen, then heated at 90° C. for 4 h. The solution was cooled to room temperature, and poured into ice water. The pH of the solution was adjusted to approximately pH 10 with 2M aqueous sodium carbonate solution. The mixture was extracted with ether and the organic layer was dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure to dryness. The residue was dissolved in ethyl acetate. Addition of hexanes to the solution gave 3-(2,6-dichlorophenyl)-5-(3-nitrophenyl)-1,2,4-oxadiazole as a white solid (0.69 g). NMR (300 MHz, DMSO-d₆): 8.52 (s, 1H), 8.38 (d, 1H), 8.18 (d, 1H), 7.78 (t, 1H), 7.57 ppm (m, 3H). LC-MS t_(r)=38.2 min (Method W) MH⁺+NA=359

[0299] Step 2

[0300] The nitro oxadiazole prepared in Step 1 (200 mg) was dissolved in ethyl acetate (20 mL) and tin (II) chloride dihydrate (162 mg, 1.2 molar equivalent) was added. The mixture was stirred at room temperature for 1 h. An additional 1.2 molar equivalents of tin (II) chloride was added. After a further 4 h at room temperature, the reaction mixture was diluted with ethyl acetate and washed three times with water. The organic layer was dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure to give the desired 3-(2,6-dichlorophenyl)-5-(3-aminophenyl)-1,2,4-oxadiazole as a white solid in quantitative yield. NMR (300 MHz, DMSO-d₆): 7.70 (m, 3H), 7.36 (s, 1H), 7.24 (d, 2H), 6.91 (m, 1H), 5.57 ppm (broad s, 2H). LC-MS t_(r)=33.1 min (Method W) MH⁺=307

[0301] Step 3

[0302] The aminophenyl oxadiazole prepared in Step 2 (200 mg) was dissolved in 5 mL of dichloromethane, triethylamine (90 mL, 1.0 molar equivalent) was added, and the mixture was cooled in an ice-bath under nitrogen. Then dichloroacetyl chloride (65 μL, 1.0 molar equivalent) was added and the mixture was allowed to stir for 2 h at 0° C. The solution was diluted with dichloromethane and then washed with saturated aqueous sodium bicarbonate followed by brine. The organic layer was dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure to give a brown oil. Purification by column chromatography on silica gel, eluting with 8:1 hexanes-ethyl acetate, gave a colorless oil. Trituration of the oil with hexanes-ethyl acetate gave the title compound, 2,2-dichloro-N-[3-[3-(2,6-dichlorophenyl)-5-(1,2,4-oxadiazolyl)]phenyl] acetamide, as a white solid (70 mg). NMR (300 MHz, CDCl₃): 8.34 (m, 2H), 8.05 (d, 1H), 8.00 (d, 1H), 7.59 (t, 1H), 7.44 (m, 3H), 6.09 ppm (s, 1H). LC-MS t_(r)=20.71 min (Method X) MH⁺=418

[0303] Preparation of Pyrazoles

[0304] 2,2Dichloro-N-[3-[3-(2,6-dichlorphenyl)-5-(pyrazolyl)]phenyl] Acetamide (Compound 189)

[0305] Step 1

[0306] To a stirred solution of lithium bis(trimethylsilyl)amide (1.0 molar in tetrahydrofuran, 11 mL, 1.1 mole equivalent) cooled at −70 under nitrogen was added dropwise a solution of 2,6 dichloroacetophenone (965 mg, 1.0 molar equivalent) in anhydrous tetrahydrofuran. The resulting mixture was stirred at −20° C. for 2 h. The reaction mixture was re-cooled to −70° C., and a solution of 3-nitrobenzoylcyanide (900 mg, 1.0 molar equivalent) in tetrahydrofuran was added dropwise. The 3-nitrobenzoylcyanide was prepared according to the procedures of S. Yamaguchi et. al. in, Bull. Chem. Soc. Jpn. 1989, 62,3036-3037. The mixture was allowed to warm to room temp over 1 h and was stirred at room temperature for 2 h. The reaction was quenched by the addition of saturated aqueous ammonium chloride. The reaction mixture was extracted with ethyl acetate. The organic layer was dried over anhydrous sodium sulfate, filtered, and concentrated under reduced pressure to dryness. The crude solid product was purified by column chromatography over silica gel using hexanes and ethyl acetate to give the desired 1-(2,6-dichlorophenyl)-3-(3-nitrophenyl)-1,3 propanedione. NMR 300 MHz (CDCL₃) 8.75 (m, 1H), 8.40 (m, 1H), 8.28 (m, 1H), 7.69 (t, 1H), 7.39 (m, 2H), 6.43 (s, 2H)

[0307] Step 2

[0308] The diketone prepared in Step 1 (100 mg) was dissolved in ethanol. To this solution was added hydrazine monohydrate (5 molar equivalents) and 1 drop of concentrated hydrochloric acid. The mixture was then heated at 80-90° C. overnight. The solvent was removed under reduced pressure. The residue was dissolved in ethyl acetate and washed with saturated sodium bicarbonate solution. The organic layer was dried over anhydrous sodium sulfate, filtered, and concentrated under reduced pressure to give the desired pyrazole as a white solid (57 mg). NMR (300 MHz, CDCl₃): 8.69 (t, 1H), 8.22 (m, 2H), 7.62 (t, 1H), 7.44 (d, 2H), 7.33 (m, 1H), 6.86 ppm (s, 1H).

[0309] LC-MS t_(r)=14.53 min (Method Y) MH⁺=333-337

[0310] Step 3

[0311] The 3-(2,6-dichlorophenyl)-5-(3-nitrophenyl) pyrazole prepared in Step 2 (57 mg) was dissolved in 50% aqueous ethanol and treated with iron powder (57 mg, 6 molar equivalents), and ammonium chloride (18.2 mg, 2 molar equivalents). The mixture was heated at 70-80° C. for 4 h. The reaction mixture was cooled to room temperature then filtered and the filtrate was concentrated to dryness under reduced pressure. The residue was dissolved in ethyl acetate and washed with water and brine. The organic layer was dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure to give 3-(2,6-dichlorophenyl)-5-(3-aminophenyl)pyrazole as a white solid (27 mg). NMR (300 MHz, CDCl₃): 7.40 (d, 2H), 7.25 (t, 1H), 7.20 (m, 1H), 7.11 (m, 2H), 6.68 ppm (m, 2H). LC-MS t_(r)=5.66 min (Method Z) MH⁺=303-307

[0312] Step 4

[0313] Dichloroacetic acid (13 mg, 1.1 molar equivalents), O-(7-azabenzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophosphate (HATU) (38 mg, 1.1 molar equivalent), and N-methylmorpholine (22 μL, 2.2 molar equivalents) were dissolved in anhydrous dichloromethane and stirred for 5 minutes. Then the 3-(2,6-dichlorophenyl)-5-(3-aminophenyl)pyrazole prepared in Step 3 was added, and the mixture stirred at room temperature overnight. The reaction mixture was diluted with ethyl acetate and washed with 1M aqueous hydrochloric acid, saturated sodium bicarbonate solution, then brine. The organic layer was dried over anhydrous sodium sulfate, filtered, and concentrated under reduced pressure. The crude product was purified by column chromatagraphy eluting with 25% ethyl acetate in hexanes to give 2,2-Dichloro-N-[3-[3-(2,6-dichlorophenyl)-5-(pyrazolyl)]phenyl] acetamide as a white solid. NMR (300 MHz, CDCl₃): 8.40 (broad s, 1H), 8.00 (broad s, 1H), 7.62 (t, 2H), 7.43 (m, 3H), 7.30 (m, 2H), 6.78 (broad s, 1H), 6.07 ppm (s, 1H). LC-MS t_(r)=13.75 min (Method Y) MH⁺=415-419.

[0314] General Phenol Alkylation Procedure (FIG. 8)

[0315] The phenol starting material (which may be either the appropriately substituted hydroxybenzaldehyde or 2,2-dichloro-N-[2-[3-(2-chloro-6-hydroxyphenyl)-5-isoxazoyl]phenyl] acetamide) was dissolved in dimethylformamide with 1.5 equivalents of potassium carbonate and one equivalent of the appropriate chloro- or bromo-alkylating agent. Addition of one equivalent of sodium iodide or cesium carbonate often can help increase the overall yield. The reaction mixture was then stirred at room temperature or heated at 80° C. for 6-48 hours. The reaction mixture was poured into ice water and extracted with several portions of ether. The combined organic extracts were combined and washed successively with saturated aqueous sodium bicarbonate solution and brine. The ether layer was dried over anhydrous sodium sulfate, filtered and concentrated to yield the crude product. This material was further purified by column chromatography on silica gel, eluting with hexanes-ethyl acetate to provide the desired alkylated phenol.

[0316] General Suzuki Procedure (FIG. 9)

[0317] Step 1

[0318] A 1.6 molar solution of butyllithium in hexanes was placed in a three-neck flask equipped with a stirrer, addition funnel, low-temperature thermometer and nitrogen inlet tube at 0° C. A solution of diisopropyl amine in anhydrous tetrahydrofuran was added dropwise. The resulting solution was stirred at 0° C. for ten minutes, then cooled to −78° C. Upon cooling, a solution of 1-bromo-3-chlorobenzene in anhydrous tetrahydrofuran was added dropwise. The reaction was stirred at −78° C. for one hour. Anhydrous dimethylformamide was added. The solution was allowed to slowly warm to room temperature, followed by the addition of acetic acid and water. The aqueous mixture was extracted with ether twice and the ether layers were separated. The combined ether layers were successively washed with aqueous hydrochloric acid and brine. The separated organic layer was dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The resulting residue was purified by flash column chromatography on silica gel, eluting with hexanes-ethyl acetate to yield 2-chloro-6-bromobenzaldehyde.

[0319] Step 2

[0320] 2-Chloro-6-bromobenzaldehyde (1.0 equivalent), appropriately substituted boronic acid (1.1 equivalents), dichlorobis(triphenylphosphine)palladium (II) (5 mol %), acetonitrile and aqueous sodium carbonate (1-2 molar solution) were combined in a microwave vial and sealed with a crimp seal. The mixture was microwaved at 150° C. for 5-20 min. The crude reaction mixture was then poured over Celite and washed with acetonitrile. The mixture was concentrated under reduced pressure and taken up in ethyl acetate. This organic solution was successively washed with water and brine, then dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The resulting residue was purified by flash column chromatography on silica gel, eluting with methylene chloride-methanol to provide the substituted aldehyde.

[0321] Step 3

[0322] The substituted aldehyde starting material was dissolved in pyridine solvent, and 1.0-1.2 equivalents of solid hydroxylamine hydrochloride was added in one portion and the homogeneous mixture was stirred overnight at room temperature. The mixture was concentrated under reduced pressure. The residue was dissolved in ethyl acetate and this solution was washed with either 1N hydrochloric acid followed by saturated brine, or by saturated brine alone. The ethyl acetate solution was then dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure to yield the desired oxime.

[0323] Step 4

[0324] The oxime (1.1 equivalents), 2,2-dichloro-N-(3-ethynylphenyl) acetamide (one equivalent), chloramine-T hydrate (1.2 equivalents) and ethanol were combined in a microwave vial and sealed with a crimp seal. The mixture was microwaved at 100° C. for 600-1200 seconds. The resulting mixture was concentrated under reduced pressure and taken up in ethyl acetate. This organic solution was washed with ice-cold 1N sodium hydroxide and brine. The organic layer was dried over sodium sulfate, filtered and concentrated under reduced pressure. The resulting residue was purified by flash column chromatography on silica gel, eluting with methylene chloride-methanol to provide the corresponding acetamide compound.

[0325] General SnAr Procedure (FIG. 10)

[0326] Step 1

[0327] A mixture of potassium carbonate (1.2 equivalents), substituted amine (1.2 equivalents) and 2-chloro-6-fluorobenzaldehyde (1 equivalent) in anhydrous dimethylformamide was heated at 130° C. for 3-24 hours. Progress of the reaction was followed by TLC. Upon consumption of the starting material, the reaction mixture was cooled to room temperature and poured into ice water. The aqueous layer was extracted with ether several times. The combined organic layers were washed successively with water and brine, dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The resulting residue was purified by flash column chromatography on silica gel, eluting with hexanes-ethyl acetate to provide the corresponding substituted benzaldehyde.

[0328] Step 2

[0329] The substituted benzaldehyde (1 equivalent) was dissolved in pyridine at room temperature. Hydroxylamine hydrochloride (1.2 equivalents) was added and the mixture was allowed to stir overnight. The mixture was then concentrated under reduced pressure and the resulting residue was partitioned between ethyl acetate and brine. The separated organic layer was washed with aqueous sodium bicarbonate and brine, dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure to yield the corresponding substituted benzaldoxime.

[0330] Step 3

[0331] The substituted benzaldoxime (1 equivalent), 2,2-dichloro-N-(3-ethynylphenyl) acetamide (1 equivalent), and chloramine-T hydrate (1.1 equivalents) were combined in ethanol and refluxed for 6-24 hours. The mixture was then cooled to room temperature and diluted with ethyl acetate. The organic solution was washed with brine and then dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The resulting residue was purified by flash column chromatography, on silica gel, eluting with hexanes-ethyl acetate to give the corresponding substituted acetamide.

[0332] Synthesis of Compound Number 709 (See FIG. 11)

[0333] A mixture of potassium carbonate (260 mg, 1.9 mmol), cesium carbonate (90 mg, 0.25 mmol), cyclopropylmethyl bromide (250 mg, 1.9 mmol) and 2,2-dichloro-N-[2-[3-(2,6-chloro-6-hydroxyphenyl)-5-isoxazoyl]phenyl] acetamide (500 mg, 1.25 mmol) in anhydrous dimethylformamide (20 mL) was allowed to stir at room temperature overnight. The reaction mixture was poured into ice water and extracted with ether (3×300 mL). The combined organic layers were washed successively with aqueous sodium bicarbonate and brine, dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The resulting residue was purified by flash column chromatography on silica gel, eluting with 8:2 hexanes:ethyl acetate, twice to provide compound number 709 (8 mg, 2% yield) as a white solid. NMR (300 MHz, CDCl₃): 8.53 (s, 1H), 8.11 (s, 1H), 7.78 (m, 1H), 7.65 (m, 1H), 7.57 (m, 1H), 7.38 (m, H), 7.16 (m, 1H), 6.90 (m, 1H), 6.74 (s, 1H), 6.05 (s, 1H), 3.84 (m, 2H), 1.17 (m, 1H), 0.58 (m, 2H), 0.36 ppm (m, 2H).

[0334] Synthesis of Compound Number 684 (See FIG. 12)

[0335] Synthesis of 2-Chloro-6-bromobenzaldehyde

[0336] A 1.6 molar solution of butyllithium in hexanes (4.5 mL, 2.8 mmol) was placed in a three-neck flask equipped with a stirrer, addition funnel, low-temperature thermometer and nitrogen inlet tube at 0° C. A solution of diisopropyl amine (1.13 mL, 8.1 mmol) in anhydrous tetrahydrofuran was added dropwise. The resulting solution was stirred at 0° C. for ten minutes, then cooled to −78° C. Upon cooling, a solution of 1-bromo-3-chlorobenzene (1.4 g, 7.3 mmol) in anhydrous tetrahydrofuran was added dropwise. The reaction was allowed to stir at −78° C. for one hour. Anhydrous dimethylformamide (636 μL) was added. The solution was allowed to slowly warm to room temperature, followed by the addition of acetic acid (50 mL) and water (50 mL). The aqueous mixture was extracted with ether twice and the ether layers were separated. The combined ether layers were successively washed with aqueous hydrochloric acid and brine. The separated organic layer was dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The resulting residue was purified by flash column chromatography on silica gel, eluting with 9:1 hexanes:ethyl acetate to yield 2-chloro-6-bromobenzaldehyde as an off white solid (850 mg, 53% yield). NMR (300 MHz, CDCl₃): 10.4 (s, 1H), 7.6 (m, 1H), 7.45 (m, 1H), 7.3 ppm (m, 1H).

[0337] Synthesis of 2-Chloro-6-(4-pyridyl)benzaldehyde

[0338] 2-Chloro-6-bromobenzaldehyde (200 mg, 0.91 mmol), pyridine-4-boronic acid (125 mg, 1.0 mmol), dichlorobis(triphenylphosphine)palladium (II) (5 mol %, 30 mg), acetonitrile (2 mL) and aqueous sodium carbonate (2 molar solution, 2 mL) were combined in a microwave vial and sealed with a crimp seal. The mixture was microwaved at 150° C. for 5 min. The crude reaction mixture was then poured over Celite and washed with acetonitrile. The mixture was concentrated under reduced pressure and taken up in ethyl acetate. This organic solution was successively washed with water and brine, then dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The resulting residue was purified by flash column chromatography on silica gel, eluting with 98:2 methylene chloride:methanol to provide 2-chloro-6-(4-pyridyl)benzaldehyde (100 mg, 51% yield). NMR (300 MHz, CDCl₃): 10.3 (s, 1H), 8.65 (m, 2H), 7.55 (m, 2H), 7.2 ppm (m, 3H).

[0339] Synthesis of 2-Chloro-6-(4-pyridyl)benzaldoxime

[0340] 2-Chloro-6-(4-pyridyl)benzaldehyde (80 mg, 0.37 mmol) was dissolved in pyridine (2 mL) at room temperature. Hydroxylamine hydrochloride (26 mg, 0.38 mmol) was added and the mixture was allowed to stir overnight. The mixture was then concentrated under reduced pressure to obtain 2-chloro-6-(4-pyridyl)benzaldoxime (85 mg, 99% yield). MW=233 confirmed by LC-MS, t_(r)=8.36 min (Method Y) MH⁺=231-235

[0341] Synthesis of Compound Number 684

[0342] 2-Chloro-6-(4-pyridyl)benzaldoxime (85 mg, 0.37 mmol), 2,2-dichloro-N-(3-ethynylphenyl) acetamide (78 mg, 0.34 mmol), chloramine-T hydrate (100 mg, 0.44 mmol) and ethanol (2 mL) were combined in a microwave vial and sealed with a crimp seal. The mixture was microwaved at 100° C. for 600 seconds. The resulting mixture was concentrated under reduced pressure and taken up in ethyl acetate. This organic solution was washed with ice-cold 1N sodium hydroxide and brine. The organic layer was dried over sodium sulfate, filtered and concentrated under reduced pressure. The resulting residue was purified by flash column chromatography on silica gel, eluting with 98:2 methylene chloride:methanol to provide compound number 684, 2,2-dichloro-N-[2-[3-(2-chloro-6-(4-pyridyl)phenyl)-5-isoxazoyl]phenyl] acetamide (20 mg, 13% yield) as a light yellow solid. NMR (300 MHz, CDCl₃): 8.5 (m, 2H), 8.25 (broad s, 1H), 8.0 (m, 1H), 7.8 (m, 1H), 7.7-7.4 (m, 5H), 7.3 (m, 2H), 6.5 (s, 1H), 6.05 ppm (s, 1H).

[0343] Synthesis of Compound Number 637 (See FIG. 13)

[0344] Synthesis of 2-Chloro-6-(4-benzylpiperdine)benzaldehyde

[0345] A mixture of potassium carbonate (1.95 g, 14.1 mmol), 4-benzylpiperdine (2.42 g, 14.1 mmol) and 2-chloro-6-fluorobenzaldehyde (1.75 g, 11.06 mmol) in anhydrous dimethylformamide (20 mL) was heated at 130° C. for 3.5 hours. The reaction mixture was cooled to room temperature and poured into ice water. The aqueous layer was extracted with ether several times. The combined organic layers were washed successively with water and brine, dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The resulting residue was purified by flash column chromatography on silica gel, eluting with 7:3 hexanes:ethyl acetate to provide 2-chloro-6-(4-benzylpiperdine)benzaldehyde (3.6 g, quant. yield). NMR (300 MHz, CDCl₃): 10.2 (s, 1H), 7.3 (m, 3H), 7.2 (m, 3H), 7.1 (m, 2H), 3.3 (m, 2H), 2.8 (m, 1H), 2.65 (m, 4H), 1.68 ppm (m, 4H).

[0346] Synthesis of 2-Chloro-6-(4-benzylpiperdine)benzaldoxime

[0347] 2-Chloro-6-(4-benzylpiperdine)benzaldehyde (3.6 g, 11.5 mmol) was dissolved in pyridine (40 mL) at room temperature. Hydroxylamine hydrochloride (0.92 g, 13.3 mmol) was added and the mixture was allowed to stir overnight. The mixture was then concentrated under reduced pressure and the resulting residue was partitioned between ethyl acetate and brine. The separated organic layer was washed with aqueous sodium bicarbonate and brine, dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure to yield 2-chloro-6-(4-benzylpiperdine)benzaldoxime (3.08 g, 81% yield) as a white solid. MW=329 confirmed by LC-MS, t_(r)=13.40 min (Method Y) MH⁺=327-331

[0348] Synthesis of Compound Number 637

[0349] 2-Chloro-6-(4-benzylpiperdine)benzaldoxime (0.75 g, 2.33 mmol), 2,2-dichloro-N-(3-ethynylphenyl) acetamide (0.53 mg, 2.33 mmol), and chloramine-T hydrate (0.58 mg, 2.56 mmol) were combined in ethanol (25 mL) and refluxed for 6 hours. The mixture was then cooled to room temperature and diluted with ethyl acetate. The organic solution was washed with brine and then dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The resulting residue was purified by flash column chromatography, on silica gel, eluting with 25% ethyl acetate in hexanes to give compound number 637 as a beige solid. NMR (300 MHz, CDCl₃): 9.2 (s, 1H), 8.6 (s, 1H), 8.2 (s, 1H), 7.9 (m, 1H), 7.7-7.5 (m, 1H), 7.3-7.0 (m, 8H), 6.7 (s, 1H), 6.1 (s, 1H), 3.2 (m, 2H), 2.6 (m, 2H), 2.45 (m, 2H), 1.5 (m, 3H), 1.1 ppm (m, 2H).

[0350] The following compounds (Table 1) were prepared by the methods described above:

[0351] Compound 500: MW=479 confirmed by LC-MS, t_(r)=10.63 min (Method Y) MH⁺=477-481

[0352] Compound 501: MW=541 confirmed by LC-MS, t_(r)=12.11 min (Method Y) MH⁺=539-543

[0353] Compound 502: MW=445 confirmed by LC-MS, t_(r)=15.99 min (Method Y) MH⁺=443-447

[0354] Compound 503: MW=463 confirmed by LC-MS, t_(r)=17.42 min (Method Y) MH⁺=461-465

[0355] Compound 504: MW=464 confirmed by LC-MS, t_(r)=10.03 min (Method Y) MH⁺=462-466

[0356] Compound 505: MW=513 confirmed by LC-MS, t_(r)=15.21 min (Method Y) MH⁺=511-515

[0357] Compound 506: MW=470 confirmed by LC-MS, t_(r)=16.83 min (Method Y) MH⁺=468-472

[0358] Compound 507: MW=423 confirmed by LC-MS, t_(r)=14.45 min (Method Y) MH⁺=421-425

[0359] Compound 508: MW=451 confirmed by LC-MS, t_(r)=15.73 min (Method Y) MH⁺=449-453

[0360] Compound 509: MW=554 confirmed by LC-MS, t_(r)=16.32 min (Method Y) MH⁺=552-556

[0361] Compound 510: MW=564 confirmed by LC-MS, t_(r)=17.04 min (Method Y) MH⁺=562-566

[0362] Compound 511: MW=464 confirmed by LC-MS, t_(r)=9.95 min (Method Y) MH⁺=462-466

[0363] Compound 512: MW=421 confirmed by LC-MS, t_(r)=15.17 min (Method Y) MH⁺=419-423

[0364] Compound 513: MW=569 confirmed by LC-MS, t_(r)=13.95 min (Method Y) MH⁺=567-571

[0365] Compound 514: MW=604 confirmed by LC-MS, t_(r)=15.80 min (Method Y) MH⁺=602-606

[0366] Compound 515: MW=542 confirmed by LC-MS, t_(r)=15.27 min (Method Y) MH⁺=540-544

[0367] Compound 516: MW=541 confirmed by LC-MS, t_(r)=17.33 min (Method Y) MH⁺=539-543

[0368] Compound 517: MW=540 confirmed by LC-MS, t_(r)=16.16 min (Method Y) MH⁺=538-542

[0369] Compound 518: MW=565 confirmed by LC-MS, t_(r)=17.05 min (Method Y) MH⁺=563-567

[0370] Compound 519: MW=558 confirmed by LC-MS, t_(r)=14.83 min (Method Y) MH⁺=556-560

[0371] Compound 520: MW=576 confirmed by LC-MS, t_(r)=12.64 min (Method Y) MH⁺=574-578

[0372] Compound 521: MW=526 confirmed by LC-MS, t_(r)=11.96 min (Method Y) MH⁺=524-528

[0373] Compound 522: MW=555 confirmed by LC-MS, t_(r)=10.90 min (Method Y) MH⁺=553-557

[0374] Compound 523: MW=555 confirmed by LC-MS, t_(r)=11.77 min (Method Y) MH⁺=553-557

[0375] Compound 524: MW=570 confirmed by LC-MS, t_(r)=17.13 min (Method Y) MH⁺=568-572

[0376] Compound 525: MW=559 confirmed by LC-MS, t_(r)=17.40 min (Method Y) MH⁺=557-561

[0377] Compound 526: MW=555 confirmed by LC-MS, t_(r)=11.40 min (Method Y) MH⁺=553-557

[0378] Compound 527: MW=589 confirmed by LC-MS, t_(r)=17.15 min (Method Y) MH⁺=587-591

[0379] Compound 528: MW=479 confirmed by LC-MS, t_(r)=14.10 min (Method Y) MH⁺=477-481

[0380] Compound 529: MW=545 confirmed by LC-MS, t_(r)=15.34 min (Method Y) MH⁺=543-547

[0381] Compound 530: MW=559 confirmed by LC-MS, t_(r)=14.49 min (Method Y) MH⁺=557-561

[0382] Compound 531: MW=535 confirmed by LC-MS, t_(r)=15.06 min(Method Y) MH⁺=533-537

[0383] Compound 532: MW=711 confirmed by LC-MS, t_(r)=16.88 min (Method Y) MH⁺=709-713

[0384] Compound 533: MW=582 confirmed by LC-MS, t_(r)=15.55 min (Method Y) MH⁺=580-584

[0385] Compound 534: MW=583 confirmed by LC-MS, t_(r)=15.34 min (Method Y) MH⁺=581-585

[0386] Compound 535: MW=532 confirmed by LC-MS, t_(r)=14.59 min (Method Y) MH⁺=530-534

[0387] Compound 536: MW=610 confirmed by LC-MS, t_(r)=18.03 min (Method Y) MH⁺=608-612

[0388] Compound 537: MW=566 confirmed by LC-MS, t_(r)=16.75 min (Method Y) MH⁺=564-568

[0389] Compound 538: MW=610 confirmed by LC-MS, t_(r)=18.20 min (Method Y) MH⁺=608-612

[0390] Compound 539: MW=558 confirmed by LC-MS, t_(r)=11.35 min (Method Y) MH⁺=556-560

[0391] Compound 540: MW=571 confirmed by LC-MS, t_(r)=15.41 min (Method Y) MH⁺=569-573

[0392] Compound 541: MW=611 confirmed by LC-MS, t_(r)=11.30 min (Method Y) MH⁺=609-613

[0393] Compound 542: MW=393 confirmed by LC-MS, t_(r)=14.45 min (Method Y) MH⁺=391-395

[0394] Compound 543: MW=572 confirmed by LC-MS, t_(r)=15.11 min (Method Y) MH⁺=570-574

[0395] Compound 544: MW=583 confirmed by LC-MS, t_(r)=15.73 min (Method Y) MH⁺=581-585

[0396] Compound 545: MW=583 confirmed by LC-MS, t_(r)=14.30 min (Method Y) MH⁺=581-585

[0397] Compound 546: MW=556 confirmed by LC-MS, t_(r)=14.49 min (Method Y) MH⁺=554-558

[0398] Compound 547: MW=617 confirmed by LC-MS, t_(r)=16.27 min (Method Y) MH⁺=615-619

[0399] Compound 548: MW=597 confirmed by LC-MS, t_(r)=15.67 min (Method Y) MH⁺=595-599

[0400] Compound 549: MW=554 confirmed by LC-MS, t_(r)=12.62 min (Method Y) MH⁺=552-556

[0401] Compound 550: MW=541 confirmed by LC-MS, t_(r)=12.08 min (Method Y) MH⁺=539-543

[0402] Compound 551: MW=549 confirmed by LC-MS, t_(r)=10.62 min (Method Y) MH⁺=547-551

[0403] Compound 552: MW=569 confirmed by LC-MS, t_(r)=13.54 min (Method Y) MH⁺=567-571

[0404] Compound 553: MW=569 confirmed by LC-MS, t_(r)=13.70 min (Method Y) MH⁺=567-571

[0405] Compound 554: MW=574 confirmed by LC-MS, t_(r)=15.52 min (Method Y) MH⁺=572-576

[0406] Compound 555: MW=607 confirmed by LC-MS, t_(r)=14.95 min (Method Y) MH⁺=605-609

[0407] Compound 556: MW=570 confirmed by LC-MS, t_(r)=14.02 min (Method Y) MH⁺=568-572

[0408] Compound 557: MW=648 confirmed by LC-MS, t_(r)=17.38 min (Method Y) MH⁺=646-650

[0409] Compound 558: MW=583 confirmed by LC-MS, t_(r)=11.60 min (Method Y) MH⁺=581-585

[0410] Compound 559: MW=473 confirmed by LC-MS, t_(r)=14.41 min (Method Y) MH⁺=471-475

[0411] Compound 560: MW=440 confirmed by LC-MS, t_(r)=13.02 min (Method Y) MH⁺=438-442

[0412] Compound 561: MW=475 confirmed by LC-MS, t_(r)=13.82 min (Method Y) MH⁺=473-477

[0413] Compound 562: MW=503 confirmed by LC-MS, t_(r)=13.94 min (Method Y) MH⁺=501-505

[0414] Compound 563: MW=438 confirmed by LC-MS, t_(r)=15.86 min (Method Y) MH⁺=436-440

[0415] Compound 564: MW=413 confirmed by LC-MS, t_(r)=14.87 min (Method Y) MH⁺=411-415

[0416] Compound 565: MW=506 confirmed by LC-MS, t_(r)=13.87 min (Method Y) MH⁺=504-508

[0417] Compound 566: MW=563 confirmed by LC-MS, t_(r)=16.50 min (Method Y) MH⁺=561-565

[0418] Compound 567: MW=599 confirmed by LC-MS, t_(r)=17.10 min (Method Y) MH⁺=597-601

[0419] Compound 568: MW=579 confirmed by LC-MS, t_(r)=17.48 min (Method Y) MH⁺=577-581

[0420] Compound 569: MW=480 confirmed by LC-MS, t_(r)=10.54 min (Method Y) MH⁺=478-482

[0421] Compound 570: MW=579 confirmed by LC-MS, t_(r)=12.83 min (Method Y) MH⁺=577-581

[0422] Compound 571: MW=479 confirmed by LC-MS, t_(r)=10.75 min (Method Y) MH⁺=477-481

[0423] Compound 572: MW=569 confirmed by LC-MS, t_(r)=16.11 min (Method Y) MH⁺=567-571

[0424] Compound 573: MW=542 confirmed by LC-MS, t_(r)=14.97 min (Method Y) MH⁺=540-544

[0425] Compound 574: MW=535 confirmed by LC-MS, t_(r)=14.51 min (Method Y) MH⁺=533-537

[0426] Compound 575: MW=535 confirmed by LC-MS, t_(r)=14.45 min (Method Y) MH⁺=533-537

[0427] Compound 576: MW=552 confirmed by LC-MS, t_(r)=15.48 min (Method Y) MH⁺=550-554

[0428] Compound 577: MW=523 confirmed by LC-MS, t_(r)=13.42 min (Method Y) MH⁺=521-525

[0429] Compound 578: MW=553 confirmed by LC-MS, t_(r)=14.64 min (Method Y) MH⁺=551-555

[0430] Compound 579: MW=549 confirmed by LC-MS, t_(r)=14.79 min (Method Y) MH⁺=547-551

[0431] Compound 580: MW=592 confirmed by LC-MS, t_(r)=18.49 min (Method Y) MH⁺=590-594

[0432] Compound 581: MW=492 confirmed by LC-MS, t_(r)=11.53 min (Method Y) MH⁺=490-494

[0433] Compound 582: MW=534 confirmed by LC-MS, t_(r)=15.14 min (Method Y) MH⁺=532-536

[0434] Compound 583: MW=570 confirmed by LC-MS, t_(r)=15.89 min (Method Y) MH⁺=568-572

[0435] Compound 584: MW=563 confirmed by LC-MS, t_(r)=15.17 min (Method Y) MH⁺=561-565

[0436] Compound 585: MW=521 confirmed by LC-MS, t_(r)=14.40 min (Method Y) MH⁺=519-523

[0437] Compound 586: MW=525 confirmed by LC-MS, t_(r)=15.13 min (Method Y) MH⁺=523-527

[0438] Compound 587: MW=550 confirmed by LC-MS, t_(r)=14.86 min (Method Y) MH⁺=548-552

[0439] Compound 588: MW=555 confirmed by LC-MS, t_(r)=12.92 min (Method Y) MH⁺=553-557

[0440] Compound 589: MW=492 confirmed by LC-MS, t_(r)=10.82 min (Method Y) MH⁺=490-494

[0441] Compound 590; MW=623 confirmed by LC-MS, t_(r)=16.50 min (Method Y) MH⁺=621-625

[0442] Compound 591: MW=523 confirmed by LC-MS, t_(r)=11.95 min (Method Y) MH⁺=521-525

[0443] Compound 592: MW=465 confirmed by LC-MS, t_(r)=16.34 min (Method Y) MH⁺=463-467

[0444] Compound 593: MW=465 confirmed by LC-MS, t_(r)=9.68 min (Method Y) MH⁺=463-467

[0445] Compound 594: MW=460 confirmed by LC-MS, t_(r)=15.02 min (Method Y) MH⁺=458-462

[0446] Compound 595: MW=507 confirmed by LC-MS, t_(r)=13.04 min (Method Y) MH⁺=505-509

[0447] Compound 596: MW=543 confirmed by LC-MS, t_(r)=14.11 min (Method Y) MH⁺=541-545

[0448] Compound 597: MW=531 confirmed by LC-MS, t_(r)=13.36 min (Method Y) MH⁺=529-533

[0449] Compound 598: MW=469 confirmed by LC-MS, t_(r)=9.94 min (Method Y) MH⁺=467-471

[0450] Compound 599: MW=363 confirmed by LC-MS, t_(r)=14.64 min (Method Y) MH⁺=361-365

[0451] Compound 600: MW=469 confirmed by LC-MS, t_(r)=13.95 min (Method Y) MH⁺=467-471

[0452] Compound 601: MW=469 confirmed by LC-MS, t_(r)=14.21 min (Method Y) MH⁺=467-471

[0453] Compound 602: MW=511 confirmed by LC-MS, t_(r)=13.83 min (Method Y) MH⁺=509-513

[0454] Compound 603: MW=478 confirmed by LC-MS, t_(r)=9.53 min (Method Y) MH⁺=476-480

[0455] Compound 604: MW=489 confirmed by LC-MS, t_(r)=11.91 min (Method Y) MH⁺=487-491

[0456] Compound 605: MW=489 confirmed by LC-MS, t_(r)=12.95 min (Method Y) MH⁺=487-491

[0457] Compound 606: MW=483 confirmed by LC-MS, t_(r)=14.31 min (Method Y) MH⁺=481-485

[0458] Compound 607: MW=492 confirmed by LC-MS, t_(r)=9.80 min (Method Y) MH⁺=490-494

[0459] Compound 608: MW=529 confirmed by LC-MS, t_(r)=11.08 min (Method Y) MH⁺=527-531

[0460] Compound 609: MW=487 confirmed by LC-MS, t_(r)=14.60 min(Method Y) MH⁺=485-489

[0461] Compound 610: MW=371 confirmed by LC-MS, t_(r)=13.93 min (Method Y) MH⁺=369-373

[0462] Compound 611: MW-445 confirmed by LC-MS, t_(r)=9.25 min (Method Y) MH⁺=443-447

[0463] Compound 612: MW=432 confirmed by LC-MS, t_(r)=14.65 min (Method Y) MH⁺=430-434

[0464] Compound 613: MW=390 confirmed by LC-MS, t_(r)=13.94 min (Method Y) MH⁺=388-392

[0465] Compound 614: MW=507 confirmed by LC-MS, t_(r)=17.58 min (Method Y) MH⁺=505-509

[0466] Compound 615: MW=522 confirmed by LC-MS, t_(r)=15.78 min (Method Y) MH⁺=520-524

[0467] Compound 616: MW=482 confirmed by LC-MS, t_(r)=14.61 min (Method Y) MH⁺=480-484

[0468] Compound 617: MW=507 confirmed by LC-MS, t_(r)=13.98 min (Method Y) MH⁺=505-509

[0469] Compound 618: MW=566 confirmed by LC-MS, t_(r)=17.21 min (Method Y) MH⁺=564-568

[0470] Compound 619: MW=576 confirmed by LC-MS, t_(r)=18.25 min (Method Y) MH⁺=574-578

[0471] Compound 620: MW=576 confirmed by LC-MS, t_(r)=18.83 min (Method Y) MH⁺=574-578

[0472] Compound 621: MW=377 confirmed by LC-MS, t_(r)=13.26 min (Method Y) MH⁺=375-379

[0473] Compound 622: MW=599 confirmed by LC-MS, t_(r)=17.38 min (Method Y) MH⁺=597-601

[0474] Compound 623: MW=556 confirmed by LC-MS, t_(r)=13.05 min (Method Y) MH⁺=554-558

[0475] Compound 624: MW=537 confirmed by LC-MS, t_(r)=16.42 min (Method Y) MH⁺=535-539

[0476] Compound 625: MW=507 confirmed by LC-MS, t_(r)=13.13 min (Method Y) MH⁺=505-509

[0477] Compound 626: MW=524 confirmed by LC-MS, t_(r)=11.15 min (Method Y) MH⁺=522-526

[0478] Compound 627: MW=493 confirmed by LC-MS, t_(r)=11.62 min (Method Y) MH⁺=491-495

[0479] Compound 628: MW=550 confirmed by LC-MS, t_(r)=11.56 min (Method Y) MH⁺=548-552

[0480] Compound 629: MW=577 confirmed by LC-MS, t_(r)=7.97 min (Method Z) MH⁺=575-579

[0481] Compound 630: MW=536 confirmed by LC-MS, t_(r)=10.46 min (Method Y) MH⁺=534-538

[0482] Compound 631: MW=593 confirmed by LC-MS, t_(r)=10.89 min (Method Y) MH⁺=591-595

[0483] Compound 632: MW=507 confirmed by LC-MS, t_(r)=11.09 min (Method Y) MH⁺=505-509

[0484] Compound 633: MW=476 confirmed by LC-MS, t_(r)=10.64 min (Method Z) MH⁺=474-478

[0485] Compound 634: MW=533 confirmed by LC-MS, t_(r)=14.24 min (Method Y) MH⁺=531-535

[0486] Compound 635: MW=500 confirmed by LC-MS, t_(r)=12.14 min (Method Y) MH⁺=498-502

[0487] Compound 636: MW=511 confirmed by LC-MS, t_(r)=17.48 min (Method Y) MH⁺=509-513

[0488] Compound 637: MW=553 confirmed by LC-MS, t_(r)=18.89 min (Method Y) MH⁺=551-555

[0489] Compound 638: MW=539 confirmed by LC-MS, t_(r)=18.31 min (Method Y) MH⁺=537-541

[0490] Compound 639: MW=607 confirmed by LC-MS, t_(r)=17.67 min (Method Y) MH⁺=605-609

[0491] Compound 640: MW=507 confirmed by LC-MS, t_(r)=10.33 min (Method Y) MH⁺=505-509

[0492] Compound 641: MW=546 confirmed by LC-MS, t_(r)=15.27 min (Method Y) MH⁺=544-548

[0493] Compound 642: MW=568 confirmed by LC-MS, t_(r)=15.30 min (Method Y) MH⁺=566-570

[0494] Compound 643: MW=562 confirmed by LC-MS, t_(r)=14.01 min (Method Y) MH⁺=560-564

[0495] Compound 644: MW=534 confirmed by LC-MS, t_(r)=14.87 min (Method Y) MH⁺=532-536

[0496] Compound 645: MW=549 confirmed by LC-MS, t_(r)=14.61 min (Method Y) MH⁺=547-551

[0497] Compound 646: MW=612 confirmed by LC-MS, t_(r)=14.73 min (Method Y) MH⁺=610-614

[0498] Compound 647: MW=582 confirmed by LC-MS, t_(r)=12.20 min (Method Y) MH⁺=580-584

[0499] Compound 648: MW=520 confirmed by LC-MS, t_(r)=14.29 min (Method Y) MH⁺=518-522

[0500] Compound 649: MW=550 confirmed by LC-MS, t_(r)=8.45 min (Method Y) MH⁺=548-552

[0501] Compound 650: MW=556 confirmed by LC-MS, t_(r)=10.54 ml (Method Y) M=554-558

[0502] Compound 651: MW=505 confirmed by LC-MS, t_(r)=11.96 min (Method Y) MH⁺=503-507

[0503] Compound 652: MW=562 confirmed by LC-MS, t_(r)=11.22 ml (Method Y) MH⁺=560-564

[0504] Compound 653: MW=569 confirmed by LC-MS, t_(r)=12.18 min (Method Y) MH⁺=567-571

[0505] Compound 654: MW=590 confirmed by LC-MS, t_(r)=13.30 ml (Method Y) MH⁺=588-592

[0506] Compound 655: MW=593 confirmed by LC-MS, t_(r)=15.58 min (Method Y) MH⁺=591-595

[0507] Compound 656: MW=675 confirmed by LC-MS, t_(r)=16.83 min (Method Y) MH⁺=673-677

[0508] Compound 657: MW=586 confirmed by LC-MS, t_(r)=15.24 ml (Method Y) MH⁺=584-588

[0509] Compound 658: MW=704 confirmed by LC-MS, t_(r)=17.01 min (Method Y) MH⁺=702-706

[0510] Compound 659: MW=598 confirmed by IC-MS, t_(r)=16.24 ml (Method Y) MH⁺=596-600

[0511] Compound 660: MW=613 confirmed by LC-MS, t_(r)=15.17 min (Method Y) MH⁺=611-615

[0512] Compound 661: MW=637 confirmed by LC-MS, t_(r)=16.25 min (Method Y) MH⁺=635-639

[0513] Compound 662: MW=587 confirmed by LC-MS, t_(r)=15.31 min (Method Y) MH⁺=585-589

[0514] Compound 663: MW=594 confirmed by LC-MS, t_(r)=14.78 min (Method Y) MH⁺=592-596

[0515] Compound 664: MW=599 confirmed by LC-MS, t_(r)=15.13 min (Method Y) MH⁺=597-601

[0516] Compound 665: MW=581 confirmed by LC-MS, t_(r)=15.73 min (Method Y) MH⁺=579-583

[0517] Compound 666: MW=575 confirmed by LC-MS, t_(r)=10.43 min (Method Y) MH⁺=573-577

[0518] Compound 667: MW=576 confirmed by LC-MS, t_(r)=9.71 min (Method Y) MH⁺=574-578

[0519] Compound 668: MW=576 confirmed by LC-MS, t_(r)=15.16 min (Method Y) MH⁺=574-578

[0520] Compound 669: MW=496 confirmed by LC-MS, t_(r)=15.67 min (Method Y) MH⁺=494-498

[0521] Compound 670: MW=488 confirmed by LC-MS, t_(r)=16.35 min (Method Y) MH⁺=486-490

[0522] Compound 671: MW=564 confirmed by LC-MS, t_(r)=17.55 min (Method Y) MH⁺=562-566

[0523] Compound 672: MW=564 confirmed by LC-MS, t_(r)=17.25 min (Method Y) MH⁺=562-566

[0524] Compound 673: MW=464 confirmed by LC-MS, t_(r)=10.58 min (Method Y) MH⁺=462-466

[0525] Compound 674: MW=464 confirmed by LC-MS, t_(r)=10.41 min (Method Y) MH⁺=462-466

[0526] Compound 675: MW=536 confirmed by LC-MS, t_(r)=15.44 min (Method Y) MH⁺=534-538

[0527] Compound 676: MW=535 confirmed by LC-MS, t_(r)=15.30 min (Method Y) MH⁺=533-537

[0528] Compound 677: MW=507 confirmed by LC-MS, t_(r)=15.70 min (Method Y) MH⁺=505-509

[0529] Compound 678: MW=512 confirmed by LC-MS, t_(r)=17.76 min (Method Y) MH⁺=510-514

[0530] Compound 679: MW=571 confirmed by LC-MS, t_(r)=17.86 min (Method Y) MH⁺=569-573

[0531] Compound 680: MW=493 confirmed by LC-MS, t_(r)=14.58 min (Method Y) MH⁺=491-495

[0532] Compound 681: MW=604 confirmed by LC-MS, t_(r)=16.80 min (Method Y) MH⁺=602-606

[0533] Compound 682: MW=542 confirmed by LC-MS, t_(r)=15.16 min (Method Y) MH⁺=540-544

[0534] Compound 683: MW=417 confirmed by LC-MS, t_(r)=17.37 min (Method Y) MH⁺=415-419

[0535] Compound 684: MW=458 confirmed by LC-MS, t_(r)=12.39 min (Method Y) MH⁺=456-460

[0536] Compound 685: MW=458 confirmed by LC-MS, t_(r)=13.33 min (Method Y) MH⁺=456-460

[0537] Compound 686: MW=481 confirmed by LC-MS, t_(r)=16.18 min (Method Y) MH⁺=479-483

[0538] Compound 687: MW=425 confirmed by LC-MS, t_(r)=15.14 min (Method Y) MH⁺=423-427

[0539] Compound 688: MW=432 confirmed by LC-MS, t_(r)=16.85 min (Method Y) MH⁺=430-434

[0540] Compound 689: MW=494 confirmed by LC-MS, t_(r)=12.86 min (Method Y) MH⁺=492-496

[0541] Compound 690: MW=569 confirmed by LC-MS, t_(r)=15.35 min (Method Y) MH⁺=567-571

[0542] Compound 691: MW=438 confirmed by LC-MS, t_(r)=12.09 min (Method Y) MH⁺=436-440

[0543] Compound 692: MW=572 confirmed by LC-MS, t_(r)=12.98 min (Method Y) MH⁺=570-574

[0544] Compound 693: MW=572 confirmed by LC-MS, t_(r)=14.23 min (Method Y) MH⁺=570-574

[0545] Compound 694: MW=515 confirmed by LC-MS, t_(r)=11.08 min (Method Y) MH⁺=513-517

[0546] Compound 695: MW=538 confirmed by LC-MS, t_(r)=13.99 min (Method Y) MH⁺=536-540

[0547] Compound 696: MW=538 confirmed by LC-MS, t_(r)=13.97 min (Method Y) MH⁺=536-540

[0548] Compound 697: MW=583 confirmed by LC-MS, t_(r)=10.71 min (Method Y) MH⁺=581-585

[0549] Compound 698: MW=593 confirmed by LC-MS, t_(r)=15.09 min (Method Y) MH⁺=591-595

[0550] Compound 699: MW=466 confirmed by LC-MS, t_(r)=16.94 min (Method Y) MH⁺=464-468

[0551] Compound 700: MW=477 confirmed by LC-MS, t_(r)=15.43 min (Method Y) MH⁺=475-479

[0552] Compound 701: MW=465 confirmed by LC-MS, t_(r)=15.67 min (Method Y) MH⁺=463-467

[0553] Compound 702: MW=421 confirmed by LC-MS, t_(r)=12.02 min (Method Y) MH⁺=419-423

[0554] Compound 703: MW=409 confirmed by LC-MS, t_(r)=12.42 min (Method Y) MH⁺=407-411

[0555] Compound 704: MW=435 confirmed by LC-MS, t_(r)=13.86 min (Method Y) MH⁺=433-437

[0556] Compound 705: MW=423 confirmed by LC-MS, t_(r)=14.15 min (Method Y) MH⁺=421-425

[0557] Compound 706: MW=440 confirmed by LC-MS, t_(r)=15.93 min (Method Y) MH⁺=438-442

[0558] Compound 707: MW=537 confirmed by LC-MS, t_(r)=14.42 min (Method Y) MH⁺=535-539

[0559] Compound 708: MW=426 confirmed by LC-MS, t_(r)=15.50 min (Method Y) MH⁺=424-428

[0560] Compound 709: MW=452 confirmed by LC-MS, t_(r)=14.72 min (Method Y) MH⁺=450-454

[0561] Compound 710: MW=448 confirmed by LC-MS, t_(r)=14.99 min (Method Y) MH⁺=446-450

[0562] Compound 711: MW=605 confirmed by LC-MS, t_(r)=16.70 min (Method Y) MH⁺=603-607

[0563] 6.2 Exemplary Compounds of the Invention Inhibit HCV Translation or Replication

[0564] 6.2.1 Replicon Assay

[0565] The inhibitory activity of certain exemplary compounds of the invention was confirmed using an HCV replicon assay. The HCV replicon can include such features as the HCV 5′ untranslated region including the HCV IRES, the HCV 3′ untranslated region, selected HCV genes encoding HCV polypeptides, selectable markers, and a reporter gene such as luciferase, GFP, etc. In the assay, actively dividing 5-2 Luc replicon-comprising cells (obtained from Ralf Bartenschlager; see Lohmann et al., 1999, Science 285:110-113) were seeded at a density of between about 5,000 and 7,500 cells/well onto 96 well plates (about 90 μl of cells per well) and incubated at 37° C. and 5% CO₂ for 24 hours. Then, the test compound (in a volume of about 10 μl) was added to the wells at various concentrations and the cells were incubated for an additional 24 hours before luciferase assay. Briefly, the Bright-Glo reagent was diluted 1:1 with PBS and 100 μl of diluted reagent was added to each well. After 5 min of incubation at room temperature, luciferin emission was quantified with a luminometer. In this assay, the amount of test compound that yielded a 50% reduction in luciferase activity (IC₅₀) was determined.

[0566] 6.2.2 Western Blot Assay

[0567] Certain exemplary compounds of the invention were also tested for their ability to inhibit HCV replication using a quantitative Western blot analysis with antibodies specific for the HCV nonstructural protein NS5A or NS3. Actively dividing 9-13 replicon cells were seeded into Swell plates at a density of 1×10⁵ cells/well in a volume of 2 ml/well and incubated at 37° C. and 5% CO₂ for 24 hours. Various concentrations of test compounds (in a volume of 10 ul) were added to the wells and the cells incubated for another 48 hours. Protein samples were prepared from the cultured cells, resolved on a SDS-PAGE gel and transferred to a nitrocellulose membrane. The membrane was blocked with 5% non-fat milk in PBS for 1 hour at room temperature. Primary antibody (anti NS5A antibody; BIODESIGN International, Saco, Me. or anti NS3 antibody, Rigel) incubation was performed for 1 hour at room temperature, after which the membrane was washed 3 times (for 15 min per time) with PBST (PBS plus 0.1% Tween 20). Horseradish peroxidase conjugated secondary antibody incubation was performed for 1 hour at room temperature and the membrane was washed 3 times (for 15 min per time) with PBST. The membrane was then soaked in substrate solution (Pierce) and exposed to a film or quantified using an imager. In this assay, the amount of test compound that yielded a 50% reduction in the amount of NS5A or NS3 protein translated as compared to a control sample (IC₅₀) was determined.

[0568] The results of the Replicon and Western blot assays are provided in TABLE 1, below. In TABLE 1, a value of “+” indicates an IC₅₀ of 10 μM or less in the specified assay; a value of “−” indicates an IC₅₀ of greater than 10 μM in the specified assay. Many of the compounds exhibited IC₅₀s in the Replicon assay in the nanomolar range. TABLE 1

Replicon/ Cmpd Western X Y Z R² R³ R⁴ 1 +/+ N O CH Cl H H 3 −/+ N O CH Cl Cl H 5 +/+ O N CH Cl H H 7 +/+ N O CH Cl H H 9 +/+ N O CH Cl H H 11 +/+ N O CH F H H 13 +/+ N O CH Cl H H 15 +/+ N O CH F H H 21 +/+ N O CH F H H 23 + N O CH Me H

25 N O N Cl H H 27 +/+ N O CH Cl H H 29 + N O CH Cl H H 31 + N O CH C1 H H 33 + N O CH CF₃ H H 35 + N O CH CF₃ H H 37 +/+ N O CH CF₃ H H 39 + N O CH Cl H H 41 + N O CH CF₃ H H 43 + N O CH F H H 45 + N O CH OCHF₂ H H 47 + N O CH Me H H 49 + N O CH I H H 51 + N O CH F Me H 53 + N O CH F H H 57 + N O CH Cl H H 61 + N O CH OEt H H 63 + N O CH iPr H H 65 + N O CH Cl H N(Me)₂ 67 + N O CH Cl H H 69 + N O CH Me H Me 73 + N O CH Cl H

75 −/+ N O CH Cl H

77 + N O CH CF₃ H H 79 + N O CH Cl H H 81 + N O CH Cl H H 83 + N O CH Cl H H 85 + N O CH CF₃ H H 87 + O N N Cl H H 89 + N O CH CF₃ H H 91 + N O CH Me H H 93 + N O CH CF₃ H H 95 + N O CH Cl H H 97 + N O CH Cl H H 99 + N O CH Cl H H 101 +/− N O CH Cl H H 103 + N O CH Cl H H 105 + N O CH CF₃ H H 107 + N O CH Cl H H 109 + N O CH CF₃ H H 111 + N O CH Cl H H 113 + N O CH OCF₃ H H 115 + N O CH C(O)OMe H H 117 + N O CH Cl H H 119 + N O CH O-iPr H H 121 + N O CH iPr H H 123 + N O CH Ph H H 125 + N O CH Cl H

127 + N O CH Cl H H 129 + N O CH

H H 131 + N O CH Cl H H 132 + N O CH Cl H H 135 −/− N O CH Cl C(O)OMe H 137 − N O CH Cl H H 139 − N O CH Cl C(O)OH H 141 − N O CH Cl H H 143 − N O CH Cl H Cl 145 − N O CH Cl H H 149 − N O CH F Me H 151 − N O CH Cl H H 153 − N O CH F H H 155 N O CH H H H 157 − N O CH C(O)OH H H 159 N O CH H H Cl 161 − N O CH H H H 163 −/− N O CH Me Me H 165 − N O CH Cl H H 167 − N O CH Cl H H 169 − N O CH Cl H H 171 − N O CH Cl H H 173 + N O CH Cl H H 175 N O CH Cl H H 177 N O CH Cl H H 179 N O CH Br H H 181 N O CH Cl H H 183 N O CH OMe H H 185 N O CH Br H H 187 N O CH Cl H H 189 N N CH Cl H H 500 + N O CH Cl H H 501 + N O CH Cl H H 502 + N O CH Cl H H 503 + N O CH Cl H H 504 + N O CH Cl H H 505 + N O CH Cl H H 506 − N O CH Cl H H 507 + N O CH Cl H H 508 + N O CH Cl H H 509 − N O CH Cl H H 510 + N O CH Cl H H 511 + N O CH Cl H H 512 + N O CH Cl H H 513 + N O CH Cl H H 514 + N O CH Cl H H 515 + N O CH Cl H H 516 + N O CH Cl H H 517 + N O CH Cl H H 518 + N O CH Cl H H 519 + N O CH Cl H H 520 + N O CH CF₃ H H 521 + N O CH F H H 522 + N O CH Cl H H 523 + N O CH Cl H H 524 + N O CH Cl H H 525 + N O CH Cl H H 526 + N O CH Cl H H 527 + N O CH Cl H H 528 + N O CH Cl H H 529 + N O CH Cl H H 530 + N O CH Cl H H 531 + N O CH Cl H H 532 + N O CH Cl H H 533 + N O CH Cl H H 534 + N O CH Cl H H 535 + N O CH Cl H H 536 + N O CH Cl H H 537 + N O CH Cl H H 538 + N O CH Cl H H 539 + N O CH Cl H H 540 + N O CH Cl H H 541 − N O CH Cl H H 542 + N O CH Cl H H 543 + N O CH Cl H H 544 + N O CH Cl H H 545 + N O CH Cl H H 546 + N O CH Cl H H 547 + N O CH Cl H H 548 + N O CH Cl H H 549 + N O CH Cl H H 550 + N O CH Cl H H 551 + N O CH Cl H H 552 + N O CH Cl H H 553 + N O CH Cl H H 554 + N O CH Cl H H 555 + N O CH Cl H H 556 + N O CH Cl H H 557 − N O CH Cl H H 558 + N O CH Cl H H 559 + N O CH Cl H H 560 + N O CH Cl H H 561 + N O CH Cl H H 562 + N O CH Cl H H 563 + N O CH Cl H H 564 − N O CH Cl H H 565 + N O CH Cl H H 566 + N O CH Cl H H 567 + N O CH Cl H H 568 + N O CH Cl H H 569 + N O CH Cl H H 570 + N O CH Cl H H 571 + N O CH Cl H H 572 + N O CH Cl H H 573 + N O CH Cl H H 574 + N O CH Cl H H 575 + N O CH Cl H H 576 + N O CH Cl H H 577 + N O CH Cl H H 578 + N O CH Cl H H 579 + N O CH Cl H H 580 + N O CH Cl H H 581 + N O CH Cl H H 582 + N O CH Cl H H 583 + N O CH Cl H H 584 + N O CH Cl H H 585 + N O CH Cl H H 586 + N O CH Cl H H 587 + N O CH Cl H H 588 + N O CH Cl H H 589 + N O CH Cl H H 590 + N O CH Cl H H 591 + N O CH Cl H H 592 + N O CH Cl H H 593 + N O CH Cl H H 594 − N O CH Cl H H 595 + N O CH Cl H H 596 + N O CH Cl H H 597 + N O CH Cl H H 598 + N O CH

H H 599 − N O CH OH H H 600 + N O CH

H H 601 + N O CH

H H 602 + N O CH

H H 603 + N O CH Cl H H 604 + N O CH Cl H H 605 + N O CH Cl H H 606 + N O CH Cl H H 607 + N O CH Cl H H 608 − N O CH Cl H H 609 − N O CH Cl H H 610 + N O CH H H H 611 + N O CH H H H 612 + N O CH H H H 613 + N O CH F H H 614 − N O CH H H H 615 + N O CH Cl H H 616 + N O CH Cl H H 617 + N O CH Cl H H 618 + N O CH Cl H H 619 + N O CH Cl H H 620 + N O CH Cl H H 621 + N O CH H H H 622 + N O CH Cl H H 623 − N O CH Cl H H 624 + N O CH Cl H H 625 + N O CH Cl H H 626 − N O CH Cl H H 627 + N O CH Cl H H 628 + N O CH Cl H H 629 + N O CH Cl H H 630 + N O CH Cl H H 631 + N O CH Cl H H 632 + N O CH Cl H H 633 + N O CH Cl H H 634 + N O CH Cl H H 635 + N O CH Cl H H 636 + N O CH Cl H H 637 + N O CH Cl H H 638 + N O CH Cl H H 639 + N O CH Cl H H 640 + N O CH Cl H H 641 + N O CH Cl H H 642 + N O CH Cl H H 643 + N O CH Cl H H 644 + N O CH Cl H H 645 + N O CH Cl H H 646 + N O CH Cl H H 647 + N O CH Cl H H 648 + N O CH Cl H H 649 + N O CH Cl H H 650 + N O CH Cl H H 651 + N O CH Cl H H 652 + N O CH Cl H H 653 + N O CH Cl H H 654 + N O CH Cl H H 655 + N O CH Cl H H 656 + N O CH Cl H H 657 + N O CH Cl H H 658 + N O CH Cl H H 659 + N O CH Cl H H 660 + N O CH Cl H H 661 + N O CH Cl H H 662 + N O CH Cl H H 663 + N O CH Cl H H 664 + N O CH Cl H H 665 +/+ N O CH Cl H H 666 + N O CH Cl H H 667 + N O CH Cl H H 668 − N O CH Cl H H 669 + N O CH Cl H H 670 + N O CH Cl H H 671 +/+ N O CH Cl H H 672 +/+ N O CH Cl H H 673 +/+ N O CH Cl H H 674 +/+ N O CH Cl H H 675 +/+ N O CH Cl H H 676 +/+ N O CH Cl H H 677 + N O CH Cl H H 678 − N O CH Cl H H 679 + N O CH Cl H H 680 +/+ N O CH Cl H H 681 + N O CH Cl H H 682 +/+ N O CH Cl H H 683 + N O CH Cl H H 684 +/+ N O CH Cl H H 685 + N O CH Cl H H 686 + N O CH Cl H H 687 − N O CH Cl H H 688 − N O CH Cl H H 689 +/+ N O CH Cl H H 690 +/+ N O CH Cl H H 691 + N O CH Cl H H 692 +/+ N O CH Cl H H 693 − N O CH Cl H H 694 +/+ N O CH Cl H H 695 −/+ N O CH Cl H H 696 +/+ N O CH Cl H H 697 −/+ N O CH Cl H H 698 −/+ N O CH Cl H H 699 +/+ N O CH Cl H H 700 +/− N O CH —OMe H H 701 +/+ N O CH F H H 702 −/+ N O CH —OMe H H 703 −/− N O CH —F H H 704 −/− N O CH —OMe H H 705 +/+ N O CH —F H H 706 +/+ N O CH Cl H H 707 +/+ N O CH Cl H H 708 +/+ N O CH Cl H H 709 +/+ N O CH Cl H H 710 +/+ N O CH Cl H H 711 +/+ N O CH Cl H H Cmpd R⁵ R⁶ R⁸ 1 H Cl F 3 H H H 5 H Cl H 7 H

H 9 H Cl H 11 H SMe H 13 H Cl H 15 Me Cl H 21 H

H 23 H Me H 25 H Cl H 27 H F H 29 H Cl H 31 H Me H 33 H H H 35 H OH H 37 H

H 39 H iPr H 41 H F H 43 H OMe H 45 H H H 47 H Me H 49 H F H 51 H Cl H 53 F Cl H 57 H Cl H 61 H H H 63 H H H 65 H Cl H 67 H Cl H 69 H Me H 73 H Cl H 75 H Cl H 77 H OMe H 79 H

H 81 H OMe H 83 H OH H 85 H Me H 87 H Cl H 89 H

H 91 H OMe H 93 H iPr H 95 H

H 97 H

H 99 H

H 101 H Cl H 103 H nBu H 105 H

H 107 H Cl H 109 H

H 111 H

H 113 H H H 115 H H H 117 H

H 119 H H H 121 H iPr H 123 H H H 125 H H H 127 H Cl H 129 H H H 131 H

H 132 H

H 135 H Cl H 137 Cl Cl H 139 H Cl H 141 CF₃ H H 143 H

H 145 H Cl H 149 H F H 151 H

H 153 H SO₂Me H 155 H

H 157 H H H 159 H Cl H 161 H OBz H 163 H H H 165 H Cl Me 167 H Cl H 169 H Cl

171 H Cl

173 H Cl OMe 175 H

H 177 H H H 179 H H H 181 H NO₂ H 183 H H H 185 H Cl H 187 H

H 189 H Cl H 500 H

H 501 H

H 502 H Cl H 503 H

H 504 H

H 505 H

H 506 H Cl H 507 H —NHEt H 508 H —N(Et)₂ H 509 H

H 510 H

H 511 H

H 512 H N₃ H 513 H

H 514 H

H 515 H

H 516 H

H 517 H

H 518 H

H 519 H

H 520 H

H 521 H

H 522 H

H 523 H

H 524 H

H 525 H

H 526 H

H 527 H

H 528 H

H 529 H

H 530 H

H 531 H

H 532 H

533 H

534 H

535 H

H 536 H

H 537 H

H 538 H

H 539 H

H 540 H

H 541 H

H 542 H NH₂ H 543 H

H 544 H

H 545 H

H 546 H

H 547 H

H 548 H

H 549 H

H 550 H

H 551 H

H 552 H

H 553 H

H 554 H

H 555 H

H 556 H

H 557 H

H 558 H

H 559 H

H 560 H —NHC(O)CH₃ H 561 H —NHSO₂Me H 562 H

H 563 H —N₃ H 564 H —NH₂ H 565 H

H 566 H

H 567 H

H 568 H

H 569 H

H 570 H

H 571 H

H 572 H

H 573 H

H 574 H

H 575 H

H 576 H

H 577 H

H 578 H

H 579 H

H 580 H

H 581 H

H 582 H

H 583 H

H 584 H

H 585 H

H 586 H

H 587 H

H 588 H

H 589 H

H 590 H

H 591 H

H 592 H

H 593 H

H 594 H Cl COOH 595 H

H 596 H

H 0 597 H

H 598 H Cl H 599 H H H 600 H Cl H 601 H Cl H 602 H Cl H 603 H —OP(O)(OH)₂ H 604 H

H 605 H

H 606 H

H 607 H —OP(O)(OMe)OH H 608 H Cl H 609 H Cl H 610 H CN H 611 H

612 H

613 H CN H 614 H

H 615 H

H 616 H

H 617 H

H 618 H

H 619 H

H 620 H

H 621 H —CH₂OH H 622 H

H 623 H

H 624 H

H 625 H

H 626 H

H 627 H

H 628 H

H 629 H

H 630 H

H 631 H

H 632 H

H 633 H —O—P(O)OHMe H 634 H

H 635 H

H 636 H

H 637 H

H 638 H

H 639 H

H 640 H

H 641 H

H 642 H

H 643 H

H 644 H

H 645 H

H 646 H

H 647 H

H 648 H

H 649 H

H 650 H

H 651 H

H 652 H

H 653 H

H 654 H

H 655 H

H 656 H

H 657 H

H 658 H

H 659 H

H 660 H

H 661 H

H 662 H

H 663 H

H 664 H

H 665 H

H 666 H

H 667 H

H 668 H

H 669 H

H 670 H

H 671 H

H 672 H

H 673 H

H 674 H

H 675 H

H 676 H

H 677 H I H 678 H

H 679 H

H 680 H

H 681 H

H 682 H

H 683 H

H 684 H

H 685 H

H 686 H

H 687 H —COOH H 688 H Cl −OH 689 H

H 690 H

H 691 H

H 692 H

H 693 H

H 694 H

H 695 H

H 696 H

H 697 H

H 698 H

H 699 H

H 700 H

H 701 H

H 702 H —COOH H 703 H —COOH H 704 H —COOMe H 705 H COOMe H 706 H

H 707 H

H 708 H —OEt H 709 H

H 710 H —OCHF₂ 711 H

H Cmpd R⁹ R¹⁰ R¹¹ R¹² R¹³ 1 H H H CHCl₂ H 3 H H H CHCl₂ H 5 H H H CHCl₂ H 7 H H H CHCl₂ H 9 H H H CHCl₂ H 11 H H H CHCl₂ H 13 H F H CHCl₂ H 15 H H H CHCl₂ H 21 H H H CHCl₂ H 23 H H H CHCl₂ H 25 H H H CHCl₂ H 27 H H H CHCl₂ H 29 H H H CHBr₂ H 31 H H H CHCl₂ H 33 H H H CHCl₂ H 35 H H H CHCl₂ H 37 H H H CHCl₂ H 39 H H H CHCl₂ H 41 H H H CHCl₂ H 43 H H H CHCl₂ H 45 H H H CHCl₂ H 47 H H H CHCl₂ H 49 H H H CHCl₂ H 51 H H H CHCl₂ H 53 H H H CHCl₂ H 57 H H Me CHCl₂ H 61 H H H CHCl₂ H 63 H H H CHCl₂ H 65 H H H CHCl₂ H 67 H H H CH₂Cl H 69 H H H CHCl₂ H 73 H H H CHCl₂ H 75 H H H CHCl₂ H 77 H H H CHCl₂ H 79 H H H CHCl₂ H 81 H H H CHCl₂ H 83 H H H CHCl₂ H 85 H H H CHCl₂ H 87 H H H CHCl₂ H 89 H H H CHCl₂ H 91 H H H CHCl₂ H 93 H H H CHCl₂ H 95 H H H CHCl₂ H 97 H H H CHCl₂ H 99 H H H CHCl₂ H 101 H H H CH₂I H 103 H H H CHCl₂ H 105 H H H CHCl₂ H 107 H

H CHCl₂ H 109 H H H CHCl₂ H 111 H H H CHCl₂ H 113 H H H CHCl₂ H 115 H H H CHCl₂ H 117 H H H CHCl₂ H 119 H H H CHCl₂ H 121 H H H CHCl₂ H 123 H H H CHCl₂ H 125 H H H CHCl₂ H 127 H OMe H CHCl₂ H 129 H H H CHCl₂ H 131 H H H CHCl₂ H 132 H H H CHCl₂ H 135 H H H CHCl₂ H 137 H H H CHCl₂ H 139 H H H CHCl₂ H 141 H H H CHCl₂ H 143 H H H CHCl₂ H 145 H H H CHF₂ H 149 H H H CHCl₂ H 151 H H H CHCl₂ H 153 H H H CHCl₂ H 155 H H H CHCl₂ H 157 H H H CHCl₂ H 159 H H H CHCl₂ H 161 H H H CHCl₂ H 163 H H H CHCl₂ H 165 H H H CHCl₂ H 167 H H H CHCl₂ Me 169 H H H CHCl₂ H 171 H H H CHCl₂ H 173 H H H CHCl₂ H 175 H H H CHCl₂ H 177 H H H CHCl₂ H 179 H H H CHCl₂ H 181 H H H CHCl₂ H 183 H H H CHCl₂ H 185 H H H CHCl₂ H 187 H H H CHCl₂ H 189 H H H CHCl₂ H 500 H H H CHCl₂ H 501 H H H CHCl₂ H 502 H H Et CHCl₂ H 503 H H H CHCl₂ H 504 H H H CHCl₂ H 505 H H Me CHCl₂ H 506 H H

CHCl₂ H 507 H H H CHCl₂ H 508 H H H CHCl₂ H 509 H H

CHCl₂ H 510 H H H CHCl₂ H 511 H H H CHCl₂ H 512 H H H CHCl₂ H 513 H H H CHCl₂ H 514 H H H CHCl₂ H 515 H H H CHCl₂ H 516 H H H CHCl₂ H 517 H H H CHCl₂ H 518 H H H CHCl₂ H 519 H H H CHCl₂ H 520 H H H CHCl₂ H 521 H H H CHCl₂ H 522 H H H CHCl₂ H 523 H H H CHCl₂ H 524 H H H CHCl₂ H 525 H H H CHCl₂ H 526 H H H CHCl₂ H 527 H H H CHCl₂ H 528 H H H CHCl₂ H 529 H H H CHCl₂ H 530 H H H CHCl₂ H 531 H H H CHCl₂ H 532 H H H CHCl₂ H 533 H H H CHCl₂ H 534 H H H CHCl₂ H 535 H H H CHCl₂ H 536 H H H CHCl₂ H 537 H H H CHCl₂ H 538 H H H CHCl₂ H 539 H H H CHCl₂ H 540 H H H CHCl₂ H 541 H H H CHCl₂ H 542 H H H CHCl₂ H 543 H H H CHCl₂ H 544 H H H CHCl₂ H 545 H H H CHCl₂ H 546 H H H CHCl₂ H 547 H H H CHCl₂ H 548 H H H CHCl₂ H 549 H H H CHCl₂ H 550 H H H CHCl₂ H 551 H H H CHCl₂ H 552 H H H CHCl₂ H 553 H H H CHCl₂ H 554 H H H CHCl₂ H 555 H H H CHCl₂ H 556 H H H CHCl₂ H 557 H H H CHCl₂ H 558 H H H CHCl₂ H 559 H H H CHCl₂ H 560 H H H CHCl₂ H 561 H H H CHCl₂ H 562 H H H CHCl₂ H 563 H H Me CHCl₂ H 564 H H Me CHCl₂ H 565 H H H CHCl₂ H 566 H H H CHCl₂ H 567 H H H CHCl₂ H 568 H H H CHCl₂ H 569 H H H CHCl₂ H 570 H H H CHCl₂ H 571 H H H CHCl₂ H 572 H H H CHCl₂ H 573 H H H CHCl₂ H 574 H H H CHCl₂ H 575 H H H CHCl₂ H 576 H H H CHCl₂ H 577 H H H CHCl₂ H 578 H H H CHCl₂ H 579 H H H CHCl₂ H 580 H H H CHCl₂ H 581 H H H CHCl₂ H 582 H H H CHCl₂ H 583 H H H CHCl₂ H 584 H H H CHCl₂ H 585 H H H CHCl₂ H 586 H H H CHCl₂ H 587 H H H CHCl₂ H 588 H H H CHCl₂ H 589 H H H CHCl₂ H 590 H H H CHCl₂ H 591 H H H CHCl₂ H 592 H H H CHCl₂ H 593 H H H CHCl₂ H 594 H H H CHCl₂ H 595 H H H CHCl₂ H 596 H H H CHCl₂ H 597 H H H CHCl₂ H 598 H H H CHCl₂ H 599 H H H CHCl₂ H 600 H H H CHCl₂ H 601 H H H CHCl₂ H 602 H H H CHCl₂ H 603 H H H CHCl₂ H 604 H H H CHCl₂ H 605 H H H CHCl₂ H 606 H H H CHCl₂ H 607 H H H CHCl₂ H 608 H H

CHCl₂ H 609 H H

CHCl₂ H 610 H H H CHCl₂ H 611 H H H CHCl₂ H 612 H H H CHCl₂ H 613 H H H CHCl₂ H 614 H H H CHCl₂ H 615 H H H CHCl₂ H 616 H H H CHCl₂ H 617 H H H CHCl₂ H 618 H H H CHCl₂ H 619 H H H CHCl₂ H 620 H H H CHCl₂ H 621 H H H CHCl₂ H 622 H H H CHCl₂ H 623 H H Me CHCl₂ H 624 H H H CHCl₂ H 625 H H H CHCl₂ H 626 H H Me CHCl₂ H 627 H H H CHCl₂ H 628 H H H CHCl₂ H 629 H H H CHCl₂ H 630 H H H CHCl₂ H 631 H H H CHCl₂ H 632 H H H CHCl₂ H 633 H H H CHCl₂ H 634 H H H CHCl₂ H 635 H H H CHCl₂ H 636 H H H CHCl₂ H 637 H H H CHCl₂ H 638 H H H CHCl₂ H 639 H H H CHCl₂ H 640 H H H CHCl₂ H 641 H H H CHCl₂ H 642 H H H CHCl₂ H 643 H H H CHCl₂ H 644 H H H CHCl₂ H 645 H H H CHCl₂ H 646 H H H CHCl₂ H 647 H H H CHCl₂ H 648 H H H CHCl₂ H 649 H H H CHCl₂ H 650 H H H CHCl₂ H 651 H H H CHCl₂ H 652 H H H CHCl₂ H 653 H H H CHCl₂ H 654 H H H CHCl₂ H 655 H H H CHCl₂ H 656 H H H CHCl₂ H 657 H H H CHCl₂ H 658 H H H CHCl₂ H 659 H H H CHCl₂ H 660 H H H CHCl₂ H 661 H H H CHCl₂ H 662 H H H CHCl₂ H 663 H H H CHCl₂ H 664 H H H CHCl₂ H 665 H H H CHCl₂ H 666 H H H CHCl₂ H 667 H H H CHCl₂ H 668 H H H CHCl₂ H 669 H H H CHCl₂ H 670 H H H CHCl₂ H 671 H H H CHCl₂ H 672 H H H CHCl₂ H 673 H H H CHCl₂ H 674 H H H CHCl₂ H 675 H H H CHCl₂ H 676 H H H CHCl₂ H 677 H H H CHCl₂ H 678 H H H CHCl₂ H 679 H H H CHCl₂ H 680 H H H CHCl₂ H 681 H H H CHCl₂ H 682 H H H CHCl₂ H 683 H H H CHCl₂ H 684 H H H CHCl₂ H 685 H H H CHCl₂ H 686 H H H CHCl₂ H 687 H H H CHCl₂ H 688 H H H CHCl₂ H 689 H H H CHCl₂ H 690 H H H CHCl₂ H 691 H H H CHCl₂ H 692 H H H CHCl₂ H 693 H H H CHCl₂ H 694 H H H CHCl₂ H 695 H H H CHCl₂ H 696 H H H CHCl₂ H 697 H H H CHCl₂ H 698 H H H CHCl₂ H 699 H H H CHCl₂ H 700 H H H CHCl₂ H 701 H H H CHCl₂ H 702 H H H CHCl₂ H 703 H H H CHCl₂ H 704 H H H CHCl₂ H 705 H H H CHCl₂ H 706 H H H CHCl₂ H 707 H H H CHCl₂ H 708 H H H CHCl₂ H 709 H H H CHCl₂ H 710 H H H CHCl₂ H 711 H H H CHCl₂ H

[0569] 6.2.3 Luciferase Counter Screen

[0570] A counter screen was used to identify non-specific inhibitors of the luciferase reporter gene. In the counter screen, a cell line carrying a construct such as a CMV-driven luciferase gene was used to identify compounds that inhibit the reporter gene, and not HCV. In these CMV-Luc cells, the DNA construct, which comprises a luciferase gene downstream of a CMV promoter, is permanently integrated into the chromosome of Huh7 cells. For the counter screen, actively dividing CMV-Luc cells were seeded at a density of 5000-7500 cells/well in a volume of 90 ul/well into 96 well plate(s). The cells were then incubated at 37° C. and 5% CO₂ for 24 hours. Various concentrations of test compounds (in a volume of 10 ul) were added to the wells and the cells were incubated for another 24 hours. Bright-Glo (Pharmacia) luciferase assay reagents were added to each well according to the manufacturer's manual. Luciferin counts were taken using a luminometer. IC₅₀ values were greater than 10 μM in the counter screen luciferase inhibition assay for the compounds of TABLE 1 that were tested.

[0571] 6.2.4 PCR Assay

[0572] A TaqMan RT-PCR assay (Roche Molecular Systems, Pleasanton, Calif.) was used to analyze HCV RNA copy numbers, which confirmed if the viral genome of HCV is being replicated. Actively dividing 9-13 replicon cells were seeded at a density of 3×10⁴ cells/well in a volume of 1 ml/well into 24-well plates. The cells were then incubated at 37° C. and 5% CO₂ for 24 hours. Various concentrations of test compounds (in a volume of 10 ul) were added to the wells and the cells were incubated for an additional 2448 hours. Media was removed by aspiration and RNA samples prepared from each well. TaqMan one step RT-PCR (Roche Molecular Systems, Alameda, Calif.) was performed using the freshly prepared RNA samples according to the manufacturer's manual and analyzed on an ABI Prism 7700 Sequence Detector (Applied Biosystems). The ratio of HCV RNA to cellular GAPDH RNA was used as in indication of specificity of HCV inhibition to confirm that the viral genome was not replicated.

[0573] 6.2.5 HCV Infection Assay

[0574] The activity of compounds can also be confirmed in an HCV infection assay. The assay can be carried out essentially as described in Fournier et al., 1998, J. Gen. Virol. 79:2367-2374. Briefly, hepatocyte cells from a doner are plated on Day 1. On Day 3, the cells are inoculated with HCV virus and test compound is added. On Day 5, the medium is changed and test compound is added. On Day 7, the medium is changed and test compound is added. On Day 8, the RNA is isolated and the HCV RNA quantified using a Taqman assay or quantitative RT-PCR.

[0575] 6.3 The Compounds are Non-Toxic in Cellular and Animal Models

[0576] 6.3.1 Cytotoxicity

[0577] Compounds 67, 167, 169, 13, 1, 145, 29, 119, 63, 31, 39, 103, 123, 121, 97, 129, 79, 111, 85, 89, 109, 127, 131, 95, 47, 57, 69, 165, 161, 163, 3, 137, 15, 141, 41, 53, 33, 113, 93, 105, 77, 91, 81, 83, 35, 27, 65, 7, 135, 51, 139, 51, 49, 143, 5, 149, 11, 37, 21, 45, 61, 75, 23, 125, 73, 43, 171 and 101 were tested in a cytotoxicity assay with liver cells including an HCV replicon (5-2 Luc cells, 9-13 cells or Huh-7 cells). In the assay, cells were seeded onto 96-well plates (approx. 7500 cells/well in a volume of 90 μl) and grown for 24 hr at 37° C. On day 2, various concentrations of test compound (in a volume of 10 μl) were added to the wells and the cells were grown for an additional 48 hr at 37° C. On day 4, an ATP-dependent R-Luciferase assay (Cell Titer Glo assay) was performed to determine the number of viable cells. With the exception of compounds 67, 47, 69, 105, 27 and 23, all compounds tested exhibited an IC₅₀ of greater than 10 μM, confirming that the compounds are non-toxic. Of the remaining compounds, all but compound 69, which exhibited an IC₅₀ of 3 μM, had IC₅₀s greater than 5 μM, demonstrating that these compounds are well-tolerated, as well.

[0578] 6.3.2 Animal Studies

[0579] The safety of compounds can be evaluated in rats by both subcutaneous and intravenous administration in several experiments. Doses as high as 30 mg/kg/day can be well tolerated. The experiments that can be performed are summarized below.

[0580] In a first study the toxicity of a compound is evaluated either by the subcutaneous (SC) route or the intravenous (IV via jugular cannula) route of administration in Sprague Dawley rats. There are two male rats in each group. A dose escalation scheme is employed where a compound is delivered by IV or SC for 3 consecutive days at a dose of 10 mg/kg (study Days 1-3) in a 80%:20%-PEG/water vehicle; delivered one day IV or SC dose of 30 mg/kg (study Day 4) in 100% PEG; and an IV dose of 60 mg/kg (study Day 5) in 100% PEG.

[0581] In a second study compounds can be administered by the IV route at doses of 10 and 30 mg/kg in 100% PEG. The volume administered for the 10 mg/kg dose is 0.67 ml/kg/day and volume given the 30 mg/kg group is 2 ml/kg/day. In addition, there are two control groups. One control receives 100% PEG alone at a volume of 2 ml/kg/day while the other is an untreated sham control group. All groups (except for the untreated control with 3 male rats) have 4 male rats each. Parameters of study include: clinical observations, body weights, hematology, clinical chemistry, gross necropsy, organ weights, bone marrow assessment and histopathology of selected organs.

[0582] 6.4 Sustained Plasma Levels are Achieved

[0583] The pharmacokinetic properties of compounds of the invention can be calculated in rats, monkeys and chimpanzees using the intravenous and subcutaneous routes of administration with a variety of different delivery vehicles. Sustained plasma levels can be achieved with several different liposome suspension vehicles using subcutaneous administration: (i) 5 mg/ml of a compound in water with 100 mg/ml lecithin; (ii) 5 mg/ml of a compound in water with 100 mg/ml lecithin; and (iii) 5 mg/ml of a compound in water with 100 mg/ml lecithin and 5 mg/ml cholesterol. Based on these results, it is expected that other liposome formulations as are well-known in the art may be used to administer the compounds of the invention

[0584] All publications and patent applications cited in this specification are herein incorporated by reference as if each individual publication or patent application were specifically and individually indicated to be incorporated by reference.

[0585] Although the foregoing invention has been described in some detail by way of illustration and example for purposes of clarity of understanding, it will be readily apparent to one of ordinary skill in the art in light of the teachings of this invention that certain changes and modifications may be made thereto without departing from the spirit or scope of the appended claims. 

What is claimed is:
 1. A compound according to structural formula (I):

including the pharmaceutically acceptable salts, hydrates, solvates, N-oxides and prodrugs thereof, wherein: X and Y are each, independently of one another, N or O, provided that X and Y are not both O; Z is N or —CH—, provided that Z is —CH— when X and Y are both N; R², R³, R⁴, R⁵, R⁸, R⁹, R¹⁰ and R¹³ are each, independently of one another, selected from the group consisting of hydrogen, —OH, —SH, —CN, —NO₂, halo, fluoro, chloro, bromo, iodo, lower alkyl, substituted lower alkyl, lower heteroalkyl, substituted lower heteroalkyl, cycloalkyl, substituted cycloalkyl, cycloheteroalkyl, substituted cycloheteroalkyl, lower haloalkyl, monohalomethyl, dihalomethyl, trihalomethyl, trifluoromethyl, lower alkylthio, substituted lower alkylthio, lower alkoxy, substituted lower alkoxy, methoxy, substituted methoxy, lower heteroalkoxy, substituted lower heteroalkoxy, cycloalkoxy, substituted cycloalkoxy, cycloheteroalkoxy, substituted cycloheteroalkoxy, lower haloalkoxy, monohalomethoxy, dihalomethoxy, trihalomethoxy, trifluoromethoxy, amino, lower di- or monoalkylamino, substituted lower di- or monoalkylamino, aryl, substituted aryl, aryloxy, substituted aryloxy, phenoxy, substituted phenoxy, arylalkyl, substituted arylalkyl, arylalkyloxy, substituted arylalkyloxy, benzyl, benzyloxy, heteroaryl, substituted heteroaryl, heteroaryloxy, substituted heteroaryloxy, heteroarylalkyl, substituted heteroarylalkyl, heteroarylalkyloxy, substituted heteroarylalkyloxy, carboxyl, lower alkoxycarbonyl, substituted lower alkoxycarbonyl, aryloxycarbonyl, substituted aryloxycarbonyl, arylalkyloxycarbonyl, substituted arylalkyloxycarbonyl, carbamate, substituted carbamate, carbamoyl, substituted carbamoyl, sulfamoyl, substituted sulfamoyl and a group of the formula -L-R¹⁴, where “L” is a linker and R¹⁴ is cycloalkyl, substituted cycloalkyl, cycloheteroalkyl or substituted cycloheteroalkyl;

R¹¹ is hydrogen or lower alkyl; R¹² is dihalomethyl; L is a linker; and R¹⁶ is selected from the group consisting of hydrogen, lower alkyl, substituted lower alkyl, lower heteroalkyl, substituted lower heteroalkyl, cycloalkyl, substituted cycloalkyl, cycloheteroalkyl, substituted cycloheteroalkyl, lower haloalkyl, monohalomethyl, dihalomethyl, trihalomethyl, trifluoromethyl, lower alkylthio, substituted lower alkylthio, lower alkoxy, substituted lower alkoxy, lower heteroalkoxy, substituted lower heteroalkoxy, cycloalkoxy, substituted cycloalkoxy, cycloheteroalkoxy, substituted cycloheteroalkoxy, lower haloalkoxy, aryl, substituted aryl, aryloxy, substituted aryloxy, arylalkyl, substituted arylalkyl, arylalkyloxy, substituted arylalkyloxy, benzyl, benzyloxy, heteroaryl, substituted heteroaryl, heteroaryloxy, substituted heteroaryloxy, heteroarylalkyl, substituted heteroarylalkyl, heteroarylalkyloxy, substituted heteroarylalkyloxy, carboxyl, lower alkoxycarbonyl, substituted lower alkoxycarbonyl, aryloxycarbonyl, substituted aryloxycarbonyl, arylalkyloxycarbonyl, substituted arylalkyloxycarbonyl, carbamate, substituted carbamate, carbamoyl, substituted carbamoyl, sulfamoyl, substituted sulfamoyl and a group of the formula -L-R¹⁴, where “L” is a linker and R¹⁴ is cycloalkyl, substituted cycloalkyl, cycloheteroalkyl or substituted cycloheteroalkyl, with the provisios that for (A), R⁶, is not a lower alkyl group; for (B), R¹⁶, is not a cycloheteroalkyl; and for (C), R¹⁶ is not hydrogen.
 2. The compound of claim 1 in which R² is Cl.
 3. The compound of claim 2 in which R¹¹ is hydrogen and R¹² is dichloromethyl.
 4. The compound of claim 2 in which Z is CH.
 5. The compound of claim 3 in which X is O and Y is N.
 6. The compound of claim 3 in which X is N and Y is O.
 7. The compound of claim 3 in which X and Y are each N.
 8. The compound of claim 2 in which Z is N.
 9. The compound of any one of claims 2-8 in which R⁸, R⁹, R¹⁰ and R¹³ are each hydrogen.
 10. The compound of any one of claims 2-8 in which R³, R⁴ and R⁵ are each hydrogen.
 11. The compound of claim 1 in which R², R³, R⁴, R⁵, R⁶, R⁸, R⁹, R¹⁰ and R¹³ are selected from the substituents delineated in TABLE 1 as compound numbers 500 through
 711. 12. The compound of claim 11 which is selected from a corresponding pyrazole, isoxazole or oxadiazole analog or regioisomer thereof.
 13. The compound of claim 12 which inhibits HCV replication and/or proliferation with an IC₅₀ of 10 μM or less, as measured in an in vitro assay.
 14. A composition comprising a pharmaceutically acceptable vehicle and a compound according to claim
 1. 15. The compound of claim 14 which is a liposome suspension.
 16. The compound of claim 15 which comprises from about 0.5-30 mg/ml of the compound and about 100-200 mg/ml of a phospholipid in water.
 17. The composition of claim 16 which further includes about 5 mg/ml of cholesterol.
 18. A method of inhibiting replication and/or proliferation of a hepatitis C (“HC”) virion, comprising the step of contacting an HC virion with an amount of a compound according to claim 1 effective to inhibit replication and/or proliferation of the HC virion.
 19. The method of claim 18 which is practiced in vitro.
 20. The method of claim 19 which is practiced in vivo.
 21. A method of treating or preventing an HCV infection, comprising the step of administering to a subject an amount of a compound according to claim 1 effective to treat or prevent an HCV infection.
 22. The method of claim 21, wherein the subject is a human.
 23. The method of claim 21, wherein the compound is administered in an amount of about 0.1 mg/kg/day to 200 mg/kg/day.
 24. The method of claim 21, wherein the compound is administered in an amount of about 1 mg/kg/day to 100 mg/kg/day.
 25. The method of claim 21, wherein the compound is administered orally, intravenously or subcutaneously.
 26. The method of claim 21 which is practiced therapeutically in a subject having an HCV infection.
 27. The method of claim 21 in which the compound is administered in the form of a pharmaceutical composition comprising the compound and a pharmaceutical vehicle.
 28. The method of claim 27 in which the pharmaceutical composition is a liposome suspension.
 29. The method of claim 28 in which the liposome suspension comprises from about 0.5-30 ml of the compound and about 100-200 mg/ml of a phospholipid in water.
 30. The method of claim 29 in which the liposome suspension further includes about 5 mg/ml cholesterol.
 31. The method of claim 21 which is practiced prophylactically in a subject at risk of developing an HCV infection.
 32. An intermediate compound useful for synthesizing substituted diphenyl heterocycle compounds, said intermediate compound having a structure defined by structural formula (II):

where R¹⁵ is NO₂ or NHR, where R is hydrogen, lower alkyl or a protecting group and X, Y. Z, R², R³, R⁴, R⁵, R⁶, R⁸, R⁹, R¹⁰, R¹³ and R¹⁶ are as defined in claim 1, or a protected analog of the compound of structural formula (II).
 33. A method of synthesizing a substituted diphenyl heterocycle compound according to structural formula (I):

wherein X, Y, Z, R², R³, R⁴, R⁵, R⁶, R⁸, R⁹, R¹⁰, R¹¹, R¹², R¹³ and R¹⁶ are as defined in claim 1, comprising the steps of (1) optionally alkylating a compound according to claim 32 in which R¹⁵ is NHR with R¹¹-halide, (2) optionally deprotecting the product of step (1) and (3) acylating the product of (1) or (2) with LG-C(O)—R¹², where LG is a leaving group or an activating group, thereby yielding a compound according to structural formula (I). 